/wp-includes/pluggable.php

<?php 
/** 
 * These functions can be replaced via plugins. If plugins do not redefine these 
 * functions, then these will be used instead. 
 * 
 * @package WordPress 
 */ 
 
if ( !function_exists('wp_set_current_user') ) : 
/** 
 * Changes the current user by ID or name. 
 * 
 * Set $id to null and specify a name if you do not know a user's ID. 
 * 
 * Some WordPress functionality is based on the current user and not based on 
 * the signed in user. Therefore, it opens the ability to edit and perform 
 * actions on users who aren't signed in. 
 * 
 * @since 2.0.3 
 * @global WP_User $current_user The current user object which holds the user data. 
 * 
 * @param int    $id   User ID 
 * @param string $name User's username 
 * @return WP_User Current user User object 
 */ 
function wp_set_current_user($id, $name = '') { 
  global $current_user; 
 
  // If `$id` matches the user who's already current, there's nothing to do. 
  if ( isset( $current_user ) 
      && ( $current_user instanceof WP_User ) 
      && ( $id == $current_user->ID ) 
      && ( null !== $id ) 
 ) { 
      return $current_user; 
  } 
 
  $current_user = new WP_User( $id, $name ); 
 
  setup_userdata( $current_user->ID ); 
 
  /** 
   * Fires after the current user is set. 
   * 
   * @since 2.0.1 
   */ 
  do_action( 'set_current_user' ); 
 
  return $current_user; 
} 
endif; 
 
if ( !function_exists('wp_get_current_user') ) : 
/** 
 * Retrieve the current user object. 
 * 
 * Will set the current user, if the current user is not set. The current user 
 * will be set to the logged-in person. If no user is logged-in, then it will 
 * set the current user to 0, which is invalid and won't have any permissions. 
 * 
 * @since 2.0.3 
 * 
 * @see _wp_get_current_user() 
 * @global WP_User $current_user Checks if the current user is set. 
 * 
 * @return WP_User Current WP_User instance. 
 */ 
function wp_get_current_user() { 
  return _wp_get_current_user(); 
} 
endif; 
 
if ( !function_exists('get_userdata') ) : 
/** 
 * Retrieve user info by user ID. 
 * 
 * @since 0.71 
 * 
 * @param int $user_id User ID 
 * @return WP_User|false WP_User object on success, false on failure. 
 */ 
function get_userdata( $user_id ) { 
  return get_user_by( 'id', $user_id ); 
} 
endif; 
 
if ( !function_exists('get_user_by') ) : 
/** 
 * Retrieve user info by a given field 
 * 
 * @since 2.8.0 
 * @since 4.4.0 Added 'ID' as an alias of 'id' for the `$field` parameter. 
 * 
 * @param string     $field The field to retrieve the user with. id | ID | slug | email | login. 
 * @param int|string $value A value for $field. A user ID, slug, email address, or login name. 
 * @return WP_User|false WP_User object on success, false on failure. 
 */ 
function get_user_by( $field, $value ) { 
  $userdata = WP_User::get_data_by( $field, $value ); 
 
  if ( !$userdata ) 
      return false; 
 
  $user = new WP_User; 
  $user->init( $userdata ); 
 
  return $user; 
} 
endif; 
 
if ( !function_exists('cache_users') ) : 
/** 
 * Retrieve info for user lists to prevent multiple queries by get_userdata() 
 * 
 * @since 3.0.0 
 * 
 * @global wpdb $wpdb WordPress database abstraction object. 
 * 
 * @param array $user_ids User ID numbers list 
 */ 
function cache_users( $user_ids ) { 
  global $wpdb; 
 
  $clean = _get_non_cached_ids( $user_ids, 'users' ); 
 
  if ( empty( $clean ) ) 
      return; 
 
  $list = implode( ', ', $clean ); 
 
  $users = $wpdb->get_results( "SELECT * FROM $wpdb->users WHERE ID IN ($list)" ); 
 
  $ids = array(); 
  foreach ( $users as $user ) { 
      update_user_caches( $user ); 
      $ids[] = $user->ID; 
  } 
  update_meta_cache( 'user', $ids ); 
} 
endif; 
 
if ( !function_exists( 'wp_mail' ) ) : 
/** 
 * Send mail, similar to PHP's mail 
 * 
 * A true return value does not automatically mean that the user received the 
 * email successfully. It just only means that the method used was able to 
 * process the request without any errors. 
 * 
 * Using the two 'wp_mail_from' and 'wp_mail_from_name' hooks allow from 
 * creating a from address like 'Name <email@address.com>' when both are set. If 
 * just 'wp_mail_from' is set, then just the email address will be used with no 
 * name. 
 * 
 * The default content type is 'text/plain' which does not allow using HTML. 
 * However, you can set the content type of the email by using the 
 * {@see 'wp_mail_content_type'} filter. 
 * 
 * The default charset is based on the charset used on the blog. The charset can 
 * be set using the {@see 'wp_mail_charset'} filter. 
 * 
 * @since 1.2.1 
 * 
 * @global PHPMailer $phpmailer 
 * 
 * @param string|array $to          Array or comma-separated list of email addresses to send message. 
 * @param string       $subject     Email subject 
 * @param string       $message     Message contents 
 * @param string|array $headers     Optional. Additional headers. 
 * @param string|array $attachments Optional. Files to attach. 
 * @return bool Whether the email contents were sent successfully. 
 */ 
function wp_mail( $to, $subject, $message, $headers = '', $attachments = array() ) { 
  // Compact the input, apply the filters, and extract them back out 
 
  /** 
   * Filters the wp_mail() arguments. 
   * 
   * @since 2.2.0 
   * 
   * @param array $args A compacted array of wp_mail() arguments, including the "to" email,  
   *                    subject, message, headers, and attachments values. 
   */ 
  $atts = apply_filters( 'wp_mail', compact( 'to', 'subject', 'message', 'headers', 'attachments' ) ); 
 
  if ( isset( $atts['to'] ) ) { 
      $to = $atts['to']; 
  } 
 
  if ( isset( $atts['subject'] ) ) { 
      $subject = $atts['subject']; 
  } 
 
  if ( isset( $atts['message'] ) ) { 
      $message = $atts['message']; 
  } 
 
  if ( isset( $atts['headers'] ) ) { 
      $headers = $atts['headers']; 
  } 
 
  if ( isset( $atts['attachments'] ) ) { 
      $attachments = $atts['attachments']; 
  } 
 
  if ( ! is_array( $attachments ) ) { 
      $attachments = explode( "\n", str_replace( "\r\n", "\n", $attachments ) ); 
  } 
  global $phpmailer; 
 
  // (Re)create it, if it's gone missing 
  if ( ! ( $phpmailer instanceof PHPMailer ) ) { 
      require_once ABSPATH . WPINC . '/class-phpmailer.php'; 
      require_once ABSPATH . WPINC . '/class-smtp.php'; 
      $phpmailer = new PHPMailer( true ); 
  } 
 
  // Headers 
  $cc = $bcc = $reply_to = array(); 
 
  if ( empty( $headers ) ) { 
      $headers = array(); 
  } else { 
      if ( !is_array( $headers ) ) { 
          // Explode the headers out, so this function can take both 
          // string headers and an array of headers. 
          $tempheaders = explode( "\n", str_replace( "\r\n", "\n", $headers ) ); 
      } else { 
          $tempheaders = $headers; 
      } 
      $headers = array(); 
 
      // If it's actually got contents 
      if ( !empty( $tempheaders ) ) { 
          // Iterate through the raw headers 
          foreach ( (array) $tempheaders as $header ) { 
              if ( strpos($header, ':') === false ) { 
                  if ( false !== stripos( $header, 'boundary=' ) ) { 
                      $parts = preg_split('/boundary=/i', trim( $header ) ); 
                      $boundary = trim( str_replace( array( "'", '"' ), '', $parts[1] ) ); 
                  } 
                  continue; 
              } 
              // Explode them out 
              list( $name, $content ) = explode( ':', trim( $header ), 2 ); 
 
              // Cleanup crew 
              $name = trim( $name ); 
              $content = trim( $content ); 
 
              switch ( strtolower( $name ) ) { 
                  // Mainly for legacy -- process a From: header if it's there 
                  case 'from': 
                      $bracket_pos = strpos( $content, '<' ); 
                      if ( $bracket_pos !== false ) { 
                          // Text before the bracketed email is the "From" name. 
                          if ( $bracket_pos > 0 ) { 
                              $from_name = substr( $content, 0, $bracket_pos - 1 ); 
                              $from_name = str_replace( '"', '', $from_name ); 
                              $from_name = trim( $from_name ); 
                          } 
 
                          $from_email = substr( $content, $bracket_pos + 1 ); 
                          $from_email = str_replace( '>', '', $from_email ); 
                          $from_email = trim( $from_email ); 
 
                      // Avoid setting an empty $from_email. 
                      } elseif ( '' !== trim( $content ) ) { 
                          $from_email = trim( $content ); 
                      } 
                      break; 
                  case 'content-type': 
                      if ( strpos( $content, ';' ) !== false ) { 
                          list( $type, $charset_content ) = explode( ';', $content ); 
                          $content_type = trim( $type ); 
                          if ( false !== stripos( $charset_content, 'charset=' ) ) { 
                              $charset = trim( str_replace( array( 'charset=', '"' ), '', $charset_content ) ); 
                          } elseif ( false !== stripos( $charset_content, 'boundary=' ) ) { 
                              $boundary = trim( str_replace( array( 'BOUNDARY=', 'boundary=', '"' ), '', $charset_content ) ); 
                              $charset = ''; 
                          } 
 
                      // Avoid setting an empty $content_type. 
                      } elseif ( '' !== trim( $content ) ) { 
                          $content_type = trim( $content ); 
                      } 
                      break; 
                  case 'cc': 
                      $cc = array_merge( (array) $cc, explode( ', ', $content ) ); 
                      break; 
                  case 'bcc': 
                      $bcc = array_merge( (array) $bcc, explode( ', ', $content ) ); 
                      break; 
                  case 'reply-to': 
                      $reply_to = array_merge( (array) $reply_to, explode( ', ', $content ) ); 
                      break; 
                  default: 
                      // Add it to our grand headers array 
                      $headers[trim( $name )] = trim( $content ); 
                      break; 
              } 
          } 
      } 
  } 
 
  // Empty out the values that may be set 
  $phpmailer->ClearAllRecipients(); 
  $phpmailer->ClearAttachments(); 
  $phpmailer->ClearCustomHeaders(); 
  $phpmailer->ClearReplyTos(); 
 
  // From email and name 
  // If we don't have a name from the input headers 
  if ( !isset( $from_name ) ) 
      $from_name = 'WordPress'; 
 
  /** If we don't have an email from the input headers default to wordpress@$sitename 
   * Some hosts will block outgoing mail from this address if it doesn't exist but 
   * there's no easy alternative. Defaulting to admin_email might appear to be another 
   * option but some hosts may refuse to relay mail from an unknown domain. See 
   * https://core.trac.wordpress.org/ticket/5007. 
   */ 
 
  if ( !isset( $from_email ) ) { 
      // Get the site domain and get rid of www. 
      $sitename = strtolower( $_SERVER['SERVER_NAME'] ); 
      if ( substr( $sitename, 0, 4 ) == 'www.' ) { 
          $sitename = substr( $sitename, 4 ); 
      } 
 
      $from_email = 'wordpress@' . $sitename; 
  } 
 
  /** 
   * Filters the email address to send from. 
   * 
   * @since 2.2.0 
   * 
   * @param string $from_email Email address to send from. 
   */ 
  $from_email = apply_filters( 'wp_mail_from', $from_email ); 
 
  /** 
   * Filters the name to associate with the "from" email address. 
   * 
   * @since 2.3.0 
   * 
   * @param string $from_name Name associated with the "from" email address. 
   */ 
  $from_name = apply_filters( 'wp_mail_from_name', $from_name ); 
 
  $phpmailer->setFrom( $from_email, $from_name, false ); 
 
  // Set destination addresses 
  if ( !is_array( $to ) ) 
      $to = explode( ', ', $to ); 
 
  // Set mail's subject and body 
  $phpmailer->Subject = $subject; 
  $phpmailer->Body = $message; 
 
  // Use appropriate methods for handling addresses, rather than treating them as generic headers 
  $address_headers = compact( 'to', 'cc', 'bcc', 'reply_to' ); 
 
  foreach ( $address_headers as $address_header => $addresses ) { 
      if ( empty( $addresses ) ) { 
          continue; 
      } 
 
      foreach ( (array) $addresses as $address ) { 
          try { 
              // Break $recipient into name and address parts if in the format "Foo <bar@baz.com>" 
              $recipient_name = ''; 
 
              if ( preg_match( '/(.*)<(.+)>/', $address, $matches ) ) { 
                  if ( count( $matches ) == 3 ) { 
                      $recipient_name = $matches[1]; 
                      $address = $matches[2]; 
                  } 
              } 
 
              switch ( $address_header ) { 
                  case 'to': 
                      $phpmailer->addAddress( $address, $recipient_name ); 
                      break; 
                  case 'cc': 
                      $phpmailer->addCc( $address, $recipient_name ); 
                      break; 
                  case 'bcc': 
                      $phpmailer->addBcc( $address, $recipient_name ); 
                      break; 
                  case 'reply_to': 
                      $phpmailer->addReplyTo( $address, $recipient_name ); 
                      break; 
              } 
          } catch ( phpmailerException $e ) { 
              continue; 
          } 
      } 
  } 
 
  // Set to use PHP's mail() 
  $phpmailer->IsMail(); 
 
  // Set Content-Type and charset 
  // If we don't have a content-type from the input headers 
  if ( !isset( $content_type ) ) 
      $content_type = 'text/plain'; 
 
  /** 
   * Filters the wp_mail() content type. 
   * 
   * @since 2.3.0 
   * 
   * @param string $content_type Default wp_mail() content type. 
   */ 
  $content_type = apply_filters( 'wp_mail_content_type', $content_type ); 
 
  $phpmailer->ContentType = $content_type; 
 
  // Set whether it's plaintext, depending on $content_type 
  if ( 'text/html' == $content_type ) 
      $phpmailer->IsHTML( true ); 
 
  // If we don't have a charset from the input headers 
  if ( !isset( $charset ) ) 
      $charset = get_bloginfo( 'charset' ); 
 
  // Set the content-type and charset 
 
  /** 
   * Filters the default wp_mail() charset. 
   * 
   * @since 2.3.0 
   * 
   * @param string $charset Default email charset. 
   */ 
  $phpmailer->CharSet = apply_filters( 'wp_mail_charset', $charset ); 
 
  // Set custom headers 
  if ( !empty( $headers ) ) { 
      foreach ( (array) $headers as $name => $content ) { 
          $phpmailer->AddCustomHeader( sprintf( '%1$s: %2$s', $name, $content ) ); 
      } 
 
      if ( false !== stripos( $content_type, 'multipart' ) && ! empty($boundary) ) 
          $phpmailer->AddCustomHeader( sprintf( "Content-Type: %s;\n\t boundary=\"%s\"", $content_type, $boundary ) ); 
  } 
 
  if ( !empty( $attachments ) ) { 
      foreach ( $attachments as $attachment ) { 
          try { 
              $phpmailer->AddAttachment($attachment); 
          } catch ( phpmailerException $e ) { 
              continue; 
          } 
      } 
  } 
 
  /** 
   * Fires after PHPMailer is initialized. 
   * 
   * @since 2.2.0 
   * 
   * @param PHPMailer &$phpmailer The PHPMailer instance, passed by reference. 
   */ 
  do_action_ref_array( 'phpmailer_init', array( &$phpmailer ) ); 
 
  // Send! 
  try { 
      return $phpmailer->Send(); 
  } catch ( phpmailerException $e ) { 
 
      $mail_error_data = compact( 'to', 'subject', 'message', 'headers', 'attachments' ); 
      $mail_error_data['phpmailer_exception_code'] = $e->getCode(); 
 
      /** 
       * Fires after a phpmailerException is caught. 
       * 
       * @since 4.4.0 
       * 
       * @param WP_Error $error A WP_Error object with the phpmailerException message, and an array 
       *                        containing the mail recipient, subject, message, headers, and attachments. 
       */ 
      do_action( 'wp_mail_failed', new WP_Error( 'wp_mail_failed', $e->getMessage(), $mail_error_data ) ); 
 
      return false; 
  } 
} 
endif; 
 
if ( !function_exists('wp_authenticate') ) : 
/** 
 * Authenticate a user, confirming the login credentials are valid. 
 * 
 * @since 2.5.0 
 * @since 4.5.0 `$username` now accepts an email address. 
 * 
 * @param string $username User's username or email address. 
 * @param string $password User's password. 
 * @return WP_User|WP_Error WP_User object if the credentials are valid,  
 *                          otherwise WP_Error. 
 */ 
function wp_authenticate($username, $password) { 
  $username = sanitize_user($username); 
  $password = trim($password); 
 
  /** 
   * Filters whether a set of user login credentials are valid. 
   * 
   * A WP_User object is returned if the credentials authenticate a user. 
   * WP_Error or null otherwise. 
   * 
   * @since 2.8.0 
   * @since 4.5.0 `$username` now accepts an email address. 
   * 
   * @param null|WP_User|WP_Error $user     WP_User if the user is authenticated. 
   *                                        WP_Error or null otherwise. 
   * @param string                $username Username or email address. 
   * @param string                $password User password 
   */ 
  $user = apply_filters( 'authenticate', null, $username, $password ); 
 
  if ( $user == null ) { 
      // TODO what should the error message be? (Or would these even happen?) 
      // Only needed if all authentication handlers fail to return anything. 
      $user = new WP_Error( 'authentication_failed', __( '<strong>ERROR</strong>: Invalid username, email address or incorrect password.' ) ); 
  } 
 
  $ignore_codes = array('empty_username', 'empty_password'); 
 
  if (is_wp_error($user) && !in_array($user->get_error_code(), $ignore_codes) ) { 
      /** 
       * Fires after a user login has failed. 
       * 
       * @since 2.5.0 
       * @since 4.5.0 The value of `$username` can now be an email address. 
       * 
       * @param string $username Username or email address. 
       */ 
      do_action( 'wp_login_failed', $username ); 
  } 
 
  return $user; 
} 
endif; 
 
if ( !function_exists('wp_logout') ) : 
/** 
 * Log the current user out. 
 * 
 * @since 2.5.0 
 */ 
function wp_logout() { 
  wp_destroy_current_session(); 
  wp_clear_auth_cookie(); 
 
  /** 
   * Fires after a user is logged-out. 
   * 
   * @since 1.5.0 
   */ 
  do_action( 'wp_logout' ); 
} 
endif; 
 
if ( !function_exists('wp_validate_auth_cookie') ) : 
/** 
 * Validates authentication cookie. 
 * 
 * The checks include making sure that the authentication cookie is set and 
 * pulling in the contents (if $cookie is not used). 
 * 
 * Makes sure the cookie is not expired. Verifies the hash in cookie is what is 
 * should be and compares the two. 
 * 
 * @since 2.5.0 
 * 
 * @global int $login_grace_period 
 * 
 * @param string $cookie Optional. If used, will validate contents instead of cookie's 
 * @param string $scheme Optional. The cookie scheme to use: auth, secure_auth, or logged_in 
 * @return false|int False if invalid cookie, User ID if valid. 
 */ 
function wp_validate_auth_cookie($cookie = '', $scheme = '') { 
  if ( ! $cookie_elements = wp_parse_auth_cookie($cookie, $scheme) ) { 
      /** 
       * Fires if an authentication cookie is malformed. 
       * 
       * @since 2.7.0 
       * 
       * @param string $cookie Malformed auth cookie. 
       * @param string $scheme Authentication scheme. Values include 'auth', 'secure_auth',  
       *                       or 'logged_in'. 
       */ 
      do_action( 'auth_cookie_malformed', $cookie, $scheme ); 
      return false; 
  } 
 
  $scheme = $cookie_elements['scheme']; 
  $username = $cookie_elements['username']; 
  $hmac = $cookie_elements['hmac']; 
  $token = $cookie_elements['token']; 
  $expired = $expiration = $cookie_elements['expiration']; 
 
  // Allow a grace period for POST and Ajax requests 
  if ( wp_doing_ajax() || 'POST' == $_SERVER['REQUEST_METHOD'] ) { 
      $expired += HOUR_IN_SECONDS; 
  } 
 
  // Quick check to see if an honest cookie has expired 
  if ( $expired < time() ) { 
      /** 
       * Fires once an authentication cookie has expired. 
       * 
       * @since 2.7.0 
       * 
       * @param array $cookie_elements An array of data for the authentication cookie. 
       */ 
      do_action( 'auth_cookie_expired', $cookie_elements ); 
      return false; 
  } 
 
  $user = get_user_by('login', $username); 
  if ( ! $user ) { 
      /** 
       * Fires if a bad username is entered in the user authentication process. 
       * 
       * @since 2.7.0 
       * 
       * @param array $cookie_elements An array of data for the authentication cookie. 
       */ 
      do_action( 'auth_cookie_bad_username', $cookie_elements ); 
      return false; 
  } 
 
  $pass_frag = substr($user->user_pass, 8, 4); 
 
  $key = wp_hash( $username . '|' . $pass_frag . '|' . $expiration . '|' . $token, $scheme ); 
 
  // If ext/hash is not present, compat.php's hash_hmac() does not support sha256. 
  $algo = function_exists( 'hash' ) ? 'sha256' : 'sha1'; 
  $hash = hash_hmac( $algo, $username . '|' . $expiration . '|' . $token, $key ); 
 
  if ( ! hash_equals( $hash, $hmac ) ) { 
      /** 
       * Fires if a bad authentication cookie hash is encountered. 
       * 
       * @since 2.7.0 
       * 
       * @param array $cookie_elements An array of data for the authentication cookie. 
       */ 
      do_action( 'auth_cookie_bad_hash', $cookie_elements ); 
      return false; 
  } 
 
  $manager = WP_Session_Tokens::get_instance( $user->ID ); 
  if ( ! $manager->verify( $token ) ) { 
      do_action( 'auth_cookie_bad_session_token', $cookie_elements ); 
      return false; 
  } 
 
  // Ajax/POST grace period set above 
  if ( $expiration < time() ) { 
      $GLOBALS['login_grace_period'] = 1; 
  } 
 
  /** 
   * Fires once an authentication cookie has been validated. 
   * 
   * @since 2.7.0 
   * 
   * @param array   $cookie_elements An array of data for the authentication cookie. 
   * @param WP_User $user            User object. 
   */ 
  do_action( 'auth_cookie_valid', $cookie_elements, $user ); 
 
  return $user->ID; 
} 
endif; 
 
if ( !function_exists('wp_generate_auth_cookie') ) : 
/** 
 * Generate authentication cookie contents. 
 * 
 * @since 2.5.0 
 * 
 * @param int    $user_id    User ID 
 * @param int    $expiration The time the cookie expires as a UNIX timestamp. 
 * @param string $scheme     Optional. The cookie scheme to use: auth, secure_auth, or logged_in 
 * @param string $token      User's session token to use for this cookie 
 * @return string Authentication cookie contents. Empty string if user does not exist. 
 */ 
function wp_generate_auth_cookie( $user_id, $expiration, $scheme = 'auth', $token = '' ) { 
  $user = get_userdata($user_id); 
  if ( ! $user ) { 
      return ''; 
  } 
 
  if ( ! $token ) { 
      $manager = WP_Session_Tokens::get_instance( $user_id ); 
      $token = $manager->create( $expiration ); 
  } 
 
  $pass_frag = substr($user->user_pass, 8, 4); 
 
  $key = wp_hash( $user->user_login . '|' . $pass_frag . '|' . $expiration . '|' . $token, $scheme ); 
 
  // If ext/hash is not present, compat.php's hash_hmac() does not support sha256. 
  $algo = function_exists( 'hash' ) ? 'sha256' : 'sha1'; 
  $hash = hash_hmac( $algo, $user->user_login . '|' . $expiration . '|' . $token, $key ); 
 
  $cookie = $user->user_login . '|' . $expiration . '|' . $token . '|' . $hash; 
 
  /** 
   * Filters the authentication cookie. 
   * 
   * @since 2.5.0 
   * 
   * @param string $cookie     Authentication cookie. 
   * @param int    $user_id    User ID. 
   * @param int    $expiration The time the cookie expires as a UNIX timestamp. 
   * @param string $scheme     Cookie scheme used. Accepts 'auth', 'secure_auth', or 'logged_in'. 
   * @param string $token      User's session token used. 
   */ 
  return apply_filters( 'auth_cookie', $cookie, $user_id, $expiration, $scheme, $token ); 
} 
endif; 
 
if ( !function_exists('wp_parse_auth_cookie') ) : 
/** 
 * Parse a cookie into its components 
 * 
 * @since 2.7.0 
 * 
 * @param string $cookie 
 * @param string $scheme Optional. The cookie scheme to use: auth, secure_auth, or logged_in 
 * @return array|false Authentication cookie components 
 */ 
function wp_parse_auth_cookie($cookie = '', $scheme = '') { 
  if ( empty($cookie) ) { 
      switch ($scheme) { 
          case 'auth': 
              $cookie_name = AUTH_COOKIE; 
              break; 
          case 'secure_auth': 
              $cookie_name = SECURE_AUTH_COOKIE; 
              break; 
          case "logged_in": 
              $cookie_name = LOGGED_IN_COOKIE; 
              break; 
          default: 
              if ( is_ssl() ) { 
                  $cookie_name = SECURE_AUTH_COOKIE; 
                  $scheme = 'secure_auth'; 
              } else { 
                  $cookie_name = AUTH_COOKIE; 
                  $scheme = 'auth'; 
              } 
      } 
 
      if ( empty($_COOKIE[$cookie_name]) ) 
          return false; 
      $cookie = $_COOKIE[$cookie_name]; 
  } 
 
  $cookie_elements = explode('|', $cookie); 
  if ( count( $cookie_elements ) !== 4 ) { 
      return false; 
  } 
 
  list( $username, $expiration, $token, $hmac ) = $cookie_elements; 
 
  return compact( 'username', 'expiration', 'token', 'hmac', 'scheme' ); 
} 
endif; 
 
if ( !function_exists('wp_set_auth_cookie') ) : 
/** 
 * Log in a user by setting authentication cookies. 
 * 
 * The $remember parameter increases the time that the cookie will be kept. The 
 * default the cookie is kept without remembering is two days. When $remember is 
 * set, the cookies will be kept for 14 days or two weeks. 
 * 
 * @since 2.5.0 
 * @since 4.3.0 Added the `$token` parameter. 
 * 
 * @param int    $user_id  User ID 
 * @param bool   $remember Whether to remember the user 
 * @param mixed  $secure   Whether the admin cookies should only be sent over HTTPS. 
 *                         Default is_ssl(). 
 * @param string $token    Optional. User's session token to use for this cookie. 
 */ 
function wp_set_auth_cookie( $user_id, $remember = false, $secure = '', $token = '' ) { 
  if ( $remember ) { 
      /** 
       * Filters the duration of the authentication cookie expiration period. 
       * 
       * @since 2.8.0 
       * 
       * @param int  $length   Duration of the expiration period in seconds. 
       * @param int  $user_id  User ID. 
       * @param bool $remember Whether to remember the user login. Default false. 
       */ 
      $expiration = time() + apply_filters( 'auth_cookie_expiration', 14 * DAY_IN_SECONDS, $user_id, $remember ); 
 
      /** 
       * Ensure the browser will continue to send the cookie after the expiration time is reached. 
       * Needed for the login grace period in wp_validate_auth_cookie(). 
       */ 
      $expire = $expiration + ( 12 * HOUR_IN_SECONDS ); 
  } else { 
      /** This filter is documented in wp-includes/pluggable.php */ 
      $expiration = time() + apply_filters( 'auth_cookie_expiration', 2 * DAY_IN_SECONDS, $user_id, $remember ); 
      $expire = 0; 
  } 
 
  if ( '' === $secure ) { 
      $secure = is_ssl(); 
  } 
 
  // Front-end cookie is secure when the auth cookie is secure and the site's home URL is forced HTTPS. 
  $secure_logged_in_cookie = $secure && 'https' === parse_url( get_option( 'home' ), PHP_URL_SCHEME ); 
 
  /** 
   * Filters whether the connection is secure. 
   * 
   * @since 3.1.0 
   * 
   * @param bool $secure  Whether the connection is secure. 
   * @param int  $user_id User ID. 
   */ 
  $secure = apply_filters( 'secure_auth_cookie', $secure, $user_id ); 
 
  /** 
   * Filters whether to use a secure cookie when logged-in. 
   * 
   * @since 3.1.0 
   * 
   * @param bool $secure_logged_in_cookie Whether to use a secure cookie when logged-in. 
   * @param int  $user_id                 User ID. 
   * @param bool $secure                  Whether the connection is secure. 
   */ 
  $secure_logged_in_cookie = apply_filters( 'secure_logged_in_cookie', $secure_logged_in_cookie, $user_id, $secure ); 
 
  if ( $secure ) { 
      $auth_cookie_name = SECURE_AUTH_COOKIE; 
      $scheme = 'secure_auth'; 
  } else { 
      $auth_cookie_name = AUTH_COOKIE; 
      $scheme = 'auth'; 
  } 
 
  if ( '' === $token ) { 
      $manager = WP_Session_Tokens::get_instance( $user_id ); 
      $token = $manager->create( $expiration ); 
  } 
 
  $auth_cookie = wp_generate_auth_cookie( $user_id, $expiration, $scheme, $token ); 
  $logged_in_cookie = wp_generate_auth_cookie( $user_id, $expiration, 'logged_in', $token ); 
 
  /** 
   * Fires immediately before the authentication cookie is set. 
   * 
   * @since 2.5.0 
   * 
   * @param string $auth_cookie Authentication cookie. 
   * @param int    $expire      The time the login grace period expires as a UNIX timestamp. 
   *                            Default is 12 hours past the cookie's expiration time. 
   * @param int    $expiration  The time when the authentication cookie expires as a UNIX timestamp. 
   *                            Default is 14 days from now. 
   * @param int    $user_id     User ID. 
   * @param string $scheme      Authentication scheme. Values include 'auth', 'secure_auth', or 'logged_in'. 
   */ 
  do_action( 'set_auth_cookie', $auth_cookie, $expire, $expiration, $user_id, $scheme ); 
 
  /** 
   * Fires immediately before the logged-in authentication cookie is set. 
   * 
   * @since 2.6.0 
   * 
   * @param string $logged_in_cookie The logged-in cookie. 
   * @param int    $expire           The time the login grace period expires as a UNIX timestamp. 
   *                                 Default is 12 hours past the cookie's expiration time. 
   * @param int    $expiration       The time when the logged-in authentication cookie expires as a UNIX timestamp. 
   *                                 Default is 14 days from now. 
   * @param int    $user_id          User ID. 
   * @param string $scheme           Authentication scheme. Default 'logged_in'. 
   */ 
  do_action( 'set_logged_in_cookie', $logged_in_cookie, $expire, $expiration, $user_id, 'logged_in' ); 
 
  setcookie($auth_cookie_name, $auth_cookie, $expire, PLUGINS_COOKIE_PATH, COOKIE_DOMAIN, $secure, true); 
  setcookie($auth_cookie_name, $auth_cookie, $expire, ADMIN_COOKIE_PATH, COOKIE_DOMAIN, $secure, true); 
  setcookie(LOGGED_IN_COOKIE, $logged_in_cookie, $expire, COOKIEPATH, COOKIE_DOMAIN, $secure_logged_in_cookie, true); 
  if ( COOKIEPATH != SITECOOKIEPATH ) 
      setcookie(LOGGED_IN_COOKIE, $logged_in_cookie, $expire, SITECOOKIEPATH, COOKIE_DOMAIN, $secure_logged_in_cookie, true); 
} 
endif; 
 
if ( !function_exists('wp_clear_auth_cookie') ) : 
/** 
 * Removes all of the cookies associated with authentication. 
 * 
 * @since 2.5.0 
 */ 
function wp_clear_auth_cookie() { 
  /** 
   * Fires just before the authentication cookies are cleared. 
   * 
   * @since 2.7.0 
   */ 
  do_action( 'clear_auth_cookie' ); 
 
  setcookie( AUTH_COOKIE, ' ', time() - YEAR_IN_SECONDS, ADMIN_COOKIE_PATH, COOKIE_DOMAIN ); 
  setcookie( SECURE_AUTH_COOKIE, ' ', time() - YEAR_IN_SECONDS, ADMIN_COOKIE_PATH, COOKIE_DOMAIN ); 
  setcookie( AUTH_COOKIE, ' ', time() - YEAR_IN_SECONDS, PLUGINS_COOKIE_PATH, COOKIE_DOMAIN ); 
  setcookie( SECURE_AUTH_COOKIE, ' ', time() - YEAR_IN_SECONDS, PLUGINS_COOKIE_PATH, COOKIE_DOMAIN ); 
  setcookie( LOGGED_IN_COOKIE, ' ', time() - YEAR_IN_SECONDS, COOKIEPATH, COOKIE_DOMAIN ); 
  setcookie( LOGGED_IN_COOKIE, ' ', time() - YEAR_IN_SECONDS, SITECOOKIEPATH, COOKIE_DOMAIN ); 
 
  // Old cookies 
  setcookie( AUTH_COOKIE, ' ', time() - YEAR_IN_SECONDS, COOKIEPATH, COOKIE_DOMAIN ); 
  setcookie( AUTH_COOKIE, ' ', time() - YEAR_IN_SECONDS, SITECOOKIEPATH, COOKIE_DOMAIN ); 
  setcookie( SECURE_AUTH_COOKIE, ' ', time() - YEAR_IN_SECONDS, COOKIEPATH, COOKIE_DOMAIN ); 
  setcookie( SECURE_AUTH_COOKIE, ' ', time() - YEAR_IN_SECONDS, SITECOOKIEPATH, COOKIE_DOMAIN ); 
 
  // Even older cookies 
  setcookie( USER_COOKIE, ' ', time() - YEAR_IN_SECONDS, COOKIEPATH, COOKIE_DOMAIN ); 
  setcookie( PASS_COOKIE, ' ', time() - YEAR_IN_SECONDS, COOKIEPATH, COOKIE_DOMAIN ); 
  setcookie( USER_COOKIE, ' ', time() - YEAR_IN_SECONDS, SITECOOKIEPATH, COOKIE_DOMAIN ); 
  setcookie( PASS_COOKIE, ' ', time() - YEAR_IN_SECONDS, SITECOOKIEPATH, COOKIE_DOMAIN ); 
} 
endif; 
 
if ( !function_exists('is_user_logged_in') ) : 
/** 
 * Checks if the current visitor is a logged in user. 
 * 
 * @since 2.0.0 
 * 
 * @return bool True if user is logged in, false if not logged in. 
 */ 
function is_user_logged_in() { 
  $user = wp_get_current_user(); 
 
  return $user->exists(); 
} 
endif; 
 
if ( !function_exists('auth_redirect') ) : 
/** 
 * Checks if a user is logged in, if not it redirects them to the login page. 
 * 
 * @since 1.5.0 
 */ 
function auth_redirect() { 
  // Checks if a user is logged in, if not redirects them to the login page 
 
  $secure = ( is_ssl() || force_ssl_admin() ); 
 
  /** 
   * Filters whether to use a secure authentication redirect. 
   * 
   * @since 3.1.0 
   * 
   * @param bool $secure Whether to use a secure authentication redirect. Default false. 
   */ 
  $secure = apply_filters( 'secure_auth_redirect', $secure ); 
 
  // If https is required and request is http, redirect 
  if ( $secure && !is_ssl() && false !== strpos($_SERVER['REQUEST_URI'], 'wp-admin') ) { 
      if ( 0 === strpos( $_SERVER['REQUEST_URI'], 'http' ) ) { 
          wp_redirect( set_url_scheme( $_SERVER['REQUEST_URI'], 'https' ) ); 
          exit(); 
      } else { 
          wp_redirect( 'https://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] ); 
          exit(); 
      } 
  } 
 
  /** 
   * Filters the authentication redirect scheme. 
   * 
   * @since 2.9.0 
   * 
   * @param string $scheme Authentication redirect scheme. Default empty. 
   */ 
  $scheme = apply_filters( 'auth_redirect_scheme', '' ); 
 
  if ( $user_id = wp_validate_auth_cookie( '', $scheme) ) { 
      /** 
       * Fires before the authentication redirect. 
       * 
       * @since 2.8.0 
       * 
       * @param int $user_id User ID. 
       */ 
      do_action( 'auth_redirect', $user_id ); 
 
      // If the user wants ssl but the session is not ssl, redirect. 
      if ( !$secure && get_user_option('use_ssl', $user_id) && false !== strpos($_SERVER['REQUEST_URI'], 'wp-admin') ) { 
          if ( 0 === strpos( $_SERVER['REQUEST_URI'], 'http' ) ) { 
              wp_redirect( set_url_scheme( $_SERVER['REQUEST_URI'], 'https' ) ); 
              exit(); 
          } else { 
              wp_redirect( 'https://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] ); 
              exit(); 
          } 
      } 
 
      return;  // The cookie is good so we're done 
  } 
 
  // The cookie is no good so force login 
  nocache_headers(); 
 
  $redirect = ( strpos( $_SERVER['REQUEST_URI'], '/options.php' ) && wp_get_referer() ) ? wp_get_referer() : set_url_scheme( 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] ); 
 
  $login_url = wp_login_url($redirect, true); 
 
  wp_redirect($login_url); 
  exit(); 
} 
endif; 
 
if ( !function_exists('check_admin_referer') ) : 
/** 
 * Makes sure that a user was referred from another admin page. 
 * 
 * To avoid security exploits. 
 * 
 * @since 1.2.0 
 * 
 * @param int|string $action    Action nonce. 
 * @param string     $query_arg Optional. Key to check for nonce in `$_REQUEST` (since 2.5). 
 *                              Default '_wpnonce'. 
 * @return false|int False if the nonce is invalid, 1 if the nonce is valid and generated between 
 *                   0-12 hours ago, 2 if the nonce is valid and generated between 12-24 hours ago. 
 */ 
function check_admin_referer( $action = -1, $query_arg = '_wpnonce' ) { 
  if ( -1 == $action ) 
      _doing_it_wrong( __FUNCTION__, __( 'You should specify a nonce action to be verified by using the first parameter.' ), '3.2.0' ); 
 
  $adminurl = strtolower(admin_url()); 
  $referer = strtolower(wp_get_referer()); 
  $result = isset($_REQUEST[$query_arg]) ? wp_verify_nonce($_REQUEST[$query_arg], $action) : false; 
 
  /** 
   * Fires once the admin request has been validated or not. 
   * 
   * @since 1.5.1 
   * 
   * @param string    $action The nonce action. 
   * @param false|int $result False if the nonce is invalid, 1 if the nonce is valid and generated between 
   *                          0-12 hours ago, 2 if the nonce is valid and generated between 12-24 hours ago. 
   */ 
  do_action( 'check_admin_referer', $action, $result ); 
 
  if ( ! $result && ! ( -1 == $action && strpos( $referer, $adminurl ) === 0 ) ) { 
      wp_nonce_ays( $action ); 
      die(); 
  } 
 
  return $result; 
} 
endif; 
 
if ( !function_exists('check_ajax_referer') ) : 
/** 
 * Verifies the Ajax request to prevent processing requests external of the blog. 
 * 
 * @since 2.0.3 
 * 
 * @param int|string   $action    Action nonce. 
 * @param false|string $query_arg Optional. Key to check for the nonce in `$_REQUEST` (since 2.5). If false,  
 *                                `$_REQUEST` values will be evaluated for '_ajax_nonce', and '_wpnonce' 
 *                                (in that order). Default false. 
 * @param bool         $die       Optional. Whether to die early when the nonce cannot be verified. 
 *                                Default true. 
 * @return false|int False if the nonce is invalid, 1 if the nonce is valid and generated between 
 *                   0-12 hours ago, 2 if the nonce is valid and generated between 12-24 hours ago. 
 */ 
function check_ajax_referer( $action = -1, $query_arg = false, $die = true ) { 
  if ( -1 == $action ) { 
      _doing_it_wrong( __FUNCTION__, __( 'You should specify a nonce action to be verified by using the first parameter.' ), '4.7' ); 
  } 
 
  $nonce = ''; 
 
  if ( $query_arg && isset( $_REQUEST[ $query_arg ] ) ) 
      $nonce = $_REQUEST[ $query_arg ]; 
  elseif ( isset( $_REQUEST['_ajax_nonce'] ) ) 
      $nonce = $_REQUEST['_ajax_nonce']; 
  elseif ( isset( $_REQUEST['_wpnonce'] ) ) 
      $nonce = $_REQUEST['_wpnonce']; 
 
  $result = wp_verify_nonce( $nonce, $action ); 
 
  /** 
   * Fires once the Ajax request has been validated or not. 
   * 
   * @since 2.1.0 
   * 
   * @param string    $action The Ajax nonce action. 
   * @param false|int $result False if the nonce is invalid, 1 if the nonce is valid and generated between 
   *                          0-12 hours ago, 2 if the nonce is valid and generated between 12-24 hours ago. 
   */ 
  do_action( 'check_ajax_referer', $action, $result ); 
 
  if ( $die && false === $result ) { 
      if ( wp_doing_ajax() ) { 
          wp_die( -1, 403 ); 
      } else { 
          die( '-1' ); 
      } 
  } 
 
  return $result; 
} 
endif; 
 
if ( !function_exists('wp_redirect') ) : 
/** 
 * Redirects to another page. 
 * 
 * Note: wp_redirect() does not exit automatically, and should almost always be 
 * followed by a call to `exit;`: 
 * 
 *     wp_redirect( $url ); 
 *     exit; 
 * 
 * Exiting can also be selectively manipulated by using wp_redirect() as a conditional 
 * in conjunction with the {@see 'wp_redirect'} and {@see 'wp_redirect_location'} hooks: 
 * 
 *     if ( wp_redirect( $url ) ) { 
 *         exit; 
 *     } 
 * 
 * @since 1.5.1 
 * 
 * @global bool $is_IIS 
 * 
 * @param string $location The path to redirect to. 
 * @param int    $status   Status code to use. 
 * @return bool False if $location is not provided, true otherwise. 
 */ 
function wp_redirect($location, $status = 302) { 
  global $is_IIS; 
 
  /** 
   * Filters the redirect location. 
   * 
   * @since 2.1.0 
   * 
   * @param string $location The path to redirect to. 
   * @param int    $status   Status code to use. 
   */ 
  $location = apply_filters( 'wp_redirect', $location, $status ); 
 
  /** 
   * Filters the redirect status code. 
   * 
   * @since 2.3.0 
   * 
   * @param int    $status   Status code to use. 
   * @param string $location The path to redirect to. 
   */ 
  $status = apply_filters( 'wp_redirect_status', $status, $location ); 
 
  if ( ! $location ) 
      return false; 
 
  $location = wp_sanitize_redirect($location); 
 
  if ( !$is_IIS && PHP_SAPI != 'cgi-fcgi' ) 
      status_header($status); // This causes problems on IIS and some FastCGI setups 
 
  header("Location: $location", true, $status); 
 
  return true; 
} 
endif; 
 
if ( !function_exists('wp_sanitize_redirect') ) : 
/** 
 * Sanitizes a URL for use in a redirect. 
 * 
 * @since 2.3.0 
 * 
 * @param string $location The path to redirect to. 
 * @return string Redirect-sanitized URL. 
 **/ 
function wp_sanitize_redirect($location) { 
  $regex = '/ 
      ( 
          (?: [\xC2-\xDF][\x80-\xBF]        # double-byte sequences   110xxxxx 10xxxxxx 
          |   \xE0[\xA0-\xBF][\x80-\xBF]    # triple-byte sequences   1110xxxx 10xxxxxx * 2 
          |   [\xE1-\xEC][\x80-\xBF]{2} 
          |   \xED[\x80-\x9F][\x80-\xBF] 
          |   [\xEE-\xEF][\x80-\xBF]{2} 
          |   \xF0[\x90-\xBF][\x80-\xBF]{2} # four-byte sequences   11110xxx 10xxxxxx * 3 
          |   [\xF1-\xF3][\x80-\xBF]{3} 
          |   \xF4[\x80-\x8F][\x80-\xBF]{2} 
 ) {1, 40}                              # ...one or more times 
 )/x'; 
  $location = preg_replace_callback( $regex, '_wp_sanitize_utf8_in_redirect', $location ); 
  $location = preg_replace('|[^a-z0-9-~+_.?#=&;, /:%!*\[\]()@]|i', '', $location); 
  $location = wp_kses_no_null($location); 
 
  // remove %0d and %0a from location 
  $strip = array('%0d', '%0a', '%0D', '%0A'); 
  return _deep_replace( $strip, $location ); 
} 
 
/** 
 * URL encode UTF-8 characters in a URL. 
 * 
 * @ignore 
 * @since 4.2.0 
 * @access private 
 * 
 * @see wp_sanitize_redirect() 
 * 
 * @param array $matches RegEx matches against the redirect location. 
 * @return string URL-encoded version of the first RegEx match. 
 */ 
function _wp_sanitize_utf8_in_redirect( $matches ) { 
  return urlencode( $matches[0] ); 
} 
endif; 
 
if ( !function_exists('wp_safe_redirect') ) : 
/** 
 * Performs a safe (local) redirect, using wp_redirect(). 
 * 
 * Checks whether the $location is using an allowed host, if it has an absolute 
 * path. A plugin can therefore set or remove allowed host(s) to or from the 
 * list. 
 * 
 * If the host is not allowed, then the redirect defaults to wp-admin on the siteurl 
 * instead. This prevents malicious redirects which redirect to another host,  
 * but only used in a few places. 
 * 
 * @since 2.3.0 
 * 
 * @param string $location The path to redirect to. 
 * @param int    $status   Status code to use. 
 */ 
function wp_safe_redirect($location, $status = 302) { 
 
  // Need to look at the URL the way it will end up in wp_redirect() 
  $location = wp_sanitize_redirect($location); 
 
  /** 
   * Filters the redirect fallback URL for when the provided redirect is not safe (local). 
   * 
   * @since 4.3.0 
   * 
   * @param string $fallback_url The fallback URL to use by default. 
   * @param int    $status       The redirect status. 
   */ 
  $location = wp_validate_redirect( $location, apply_filters( 'wp_safe_redirect_fallback', admin_url(), $status ) ); 
 
  wp_redirect($location, $status); 
} 
endif; 
 
if ( !function_exists('wp_validate_redirect') ) : 
/** 
 * Validates a URL for use in a redirect. 
 * 
 * Checks whether the $location is using an allowed host, if it has an absolute 
 * path. A plugin can therefore set or remove allowed host(s) to or from the 
 * list. 
 * 
 * If the host is not allowed, then the redirect is to $default supplied 
 * 
 * @since 2.8.1 
 * 
 * @param string $location The redirect to validate 
 * @param string $default  The value to return if $location is not allowed 
 * @return string redirect-sanitized URL 
 **/ 
function wp_validate_redirect($location, $default = '') { 
  $location = trim( $location ); 
  // browsers will assume 'http' is your protocol, and will obey a redirect to a URL starting with '//' 
  if ( substr($location, 0, 2) == '//' ) 
      $location = 'http:' . $location; 
 
  // In php 5 parse_url may fail if the URL query part contains http://, bug #38143 
  $test = ( $cut = strpos($location, '?') ) ? substr( $location, 0, $cut ) : $location; 
 
  // @-operator is used to prevent possible warnings in PHP < 5.3.3. 
  $lp = @parse_url($test); 
 
  // Give up if malformed URL 
  if ( false === $lp ) 
      return $default; 
 
  // Allow only http and https schemes. No data:, etc. 
  if ( isset($lp['scheme']) && !('http' == $lp['scheme'] || 'https' == $lp['scheme']) ) 
      return $default; 
 
  // Reject if certain components are set but host is not. This catches urls like https:host.com for which parse_url does not set the host field. 
  if ( ! isset( $lp['host'] ) && ( isset( $lp['scheme'] ) || isset( $lp['user'] ) || isset( $lp['pass'] ) || isset( $lp['port'] ) ) ) { 
      return $default; 
  } 
 
  // Reject malformed components parse_url() can return on odd inputs. 
  foreach ( array( 'user', 'pass', 'host' ) as $component ) { 
      if ( isset( $lp[ $component ] ) && strpbrk( $lp[ $component ], ':/?#@' ) ) { 
          return $default; 
      } 
  } 
 
  $wpp = parse_url(home_url()); 
 
  /** 
   * Filters the whitelist of hosts to redirect to. 
   * 
   * @since 2.3.0 
   * 
   * @param array       $hosts An array of allowed hosts. 
   * @param bool|string $host  The parsed host; empty if not isset. 
   */ 
  $allowed_hosts = (array) apply_filters( 'allowed_redirect_hosts', array($wpp['host']), isset($lp['host']) ? $lp['host'] : '' ); 
 
  if ( isset($lp['host']) && ( !in_array($lp['host'], $allowed_hosts) && $lp['host'] != strtolower($wpp['host'])) ) 
      $location = $default; 
 
  return $location; 
} 
endif; 
 
if ( ! function_exists('wp_notify_postauthor') ) : 
/** 
 * Notify an author (and/or others) of a comment/trackback/pingback on a post. 
 * 
 * @since 1.0.0 
 * 
 * @param int|WP_Comment  $comment_id Comment ID or WP_Comment object. 
 * @param string          $deprecated Not used 
 * @return bool True on completion. False if no email addresses were specified. 
 */ 
function wp_notify_postauthor( $comment_id, $deprecated = null ) { 
  if ( null !== $deprecated ) { 
      _deprecated_argument( __FUNCTION__, '3.8.0' ); 
  } 
 
  $comment = get_comment( $comment_id ); 
  if ( empty( $comment ) || empty( $comment->comment_post_ID ) ) 
      return false; 
 
  $post = get_post( $comment->comment_post_ID ); 
  $author = get_userdata( $post->post_author ); 
 
  // Who to notify? By default, just the post author, but others can be added. 
  $emails = array(); 
  if ( $author ) { 
      $emails[] = $author->user_email; 
  } 
 
  /** 
   * Filters the list of email addresses to receive a comment notification. 
   * 
   * By default, only post authors are notified of comments. This filter allows 
   * others to be added. 
   * 
   * @since 3.7.0 
   * 
   * @param array $emails     An array of email addresses to receive a comment notification. 
   * @param int   $comment_id The comment ID. 
   */ 
  $emails = apply_filters( 'comment_notification_recipients', $emails, $comment->comment_ID ); 
  $emails = array_filter( $emails ); 
 
  // If there are no addresses to send the comment to, bail. 
  if ( ! count( $emails ) ) { 
      return false; 
  } 
 
  // Facilitate unsetting below without knowing the keys. 
  $emails = array_flip( $emails ); 
 
  /** 
   * Filters whether to notify comment authors of their comments on their own posts. 
   * 
   * By default, comment authors aren't notified of their comments on their own 
   * posts. This filter allows you to override that. 
   * 
   * @since 3.8.0 
   * 
   * @param bool $notify     Whether to notify the post author of their own comment. 
   *                         Default false. 
   * @param int  $comment_id The comment ID. 
   */ 
  $notify_author = apply_filters( 'comment_notification_notify_author', false, $comment->comment_ID ); 
 
  // The comment was left by the author 
  if ( $author && ! $notify_author && $comment->user_id == $post->post_author ) { 
      unset( $emails[ $author->user_email ] ); 
  } 
 
  // The author moderated a comment on their own post 
  if ( $author && ! $notify_author && $post->post_author == get_current_user_id() ) { 
      unset( $emails[ $author->user_email ] ); 
  } 
 
  // The post author is no longer a member of the blog 
  if ( $author && ! $notify_author && ! user_can( $post->post_author, 'read_post', $post->ID ) ) { 
      unset( $emails[ $author->user_email ] ); 
  } 
 
  // If there's no email to send the comment to, bail, otherwise flip array back around for use below 
  if ( ! count( $emails ) ) { 
      return false; 
  } else { 
      $emails = array_flip( $emails ); 
  } 
 
  $switched_locale = switch_to_locale( get_locale() ); 
 
  $comment_author_domain = @gethostbyaddr($comment->comment_author_IP); 
 
  // The blogname option is escaped with esc_html on the way into the database in sanitize_option 
  // we want to reverse this for the plain text arena of emails. 
  $blogname = wp_specialchars_decode(get_option('blogname'), ENT_QUOTES); 
  $comment_content = wp_specialchars_decode( $comment->comment_content ); 
 
  switch ( $comment->comment_type ) { 
      case 'trackback': 
          /** translators: 1: Post title */ 
          $notify_message = sprintf( __( 'New trackback on your post "%s"' ), $post->post_title ) . "\r\n"; 
          /** translators: 1: Trackback/pingback website name, 2: website IP, 3: website hostname */ 
          $notify_message .= sprintf( __('Website: %1$s (IP: %2$s, %3$s)'), $comment->comment_author, $comment->comment_author_IP, $comment_author_domain ) . "\r\n"; 
          $notify_message .= sprintf( __( 'URL: %s' ), $comment->comment_author_url ) . "\r\n"; 
          $notify_message .= sprintf( __( 'Comment: %s' ), "\r\n" . $comment_content ) . "\r\n\r\n"; 
          $notify_message .= __( 'You can see all trackbacks on this post here:' ) . "\r\n"; 
          /** translators: 1: blog name, 2: post title */ 
          $subject = sprintf( __('[%1$s] Trackback: "%2$s"'), $blogname, $post->post_title ); 
          break; 
      case 'pingback': 
          /** translators: 1: Post title */ 
          $notify_message = sprintf( __( 'New pingback on your post "%s"' ), $post->post_title ) . "\r\n"; 
          /** translators: 1: Trackback/pingback website name, 2: website IP, 3: website hostname */ 
          $notify_message .= sprintf( __('Website: %1$s (IP: %2$s, %3$s)'), $comment->comment_author, $comment->comment_author_IP, $comment_author_domain ) . "\r\n"; 
          $notify_message .= sprintf( __( 'URL: %s' ), $comment->comment_author_url ) . "\r\n"; 
          $notify_message .= sprintf( __( 'Comment: %s' ), "\r\n" . $comment_content ) . "\r\n\r\n"; 
          $notify_message .= __( 'You can see all pingbacks on this post here:' ) . "\r\n"; 
          /** translators: 1: blog name, 2: post title */ 
          $subject = sprintf( __('[%1$s] Pingback: "%2$s"'), $blogname, $post->post_title ); 
          break; 
      default: // Comments 
          $notify_message = sprintf( __( 'New comment on your post "%s"' ), $post->post_title ) . "\r\n"; 
          /** translators: 1: comment author, 2: author IP, 3: author domain */ 
          $notify_message .= sprintf( __( 'Author: %1$s (IP: %2$s, %3$s)' ), $comment->comment_author, $comment->comment_author_IP, $comment_author_domain ) . "\r\n"; 
          $notify_message .= sprintf( __( 'Email: %s' ), $comment->comment_author_email ) . "\r\n"; 
          $notify_message .= sprintf( __( 'URL: %s' ), $comment->comment_author_url ) . "\r\n"; 
          $notify_message .= sprintf( __('Comment: %s' ), "\r\n" . $comment_content ) . "\r\n\r\n"; 
          $notify_message .= __( 'You can see all comments on this post here:' ) . "\r\n"; 
          /** translators: 1: blog name, 2: post title */ 
          $subject = sprintf( __('[%1$s] Comment: "%2$s"'), $blogname, $post->post_title ); 
          break; 
  } 
  $notify_message .= get_permalink($comment->comment_post_ID) . "#comments\r\n\r\n"; 
  $notify_message .= sprintf( __('Permalink: %s'), get_comment_link( $comment ) ) . "\r\n"; 
 
  if ( user_can( $post->post_author, 'edit_comment', $comment->comment_ID ) ) { 
      if ( EMPTY_TRASH_DAYS ) { 
          $notify_message .= sprintf( __( 'Trash it: %s' ), admin_url( "comment.php?action=trash&c={$comment->comment_ID}#wpbody-content" ) ) . "\r\n"; 
      } else { 
          $notify_message .= sprintf( __( 'Delete it: %s' ), admin_url( "comment.php?action=delete&c={$comment->comment_ID}#wpbody-content" ) ) . "\r\n"; 
      } 
      $notify_message .= sprintf( __( 'Spam it: %s' ), admin_url( "comment.php?action=spam&c={$comment->comment_ID}#wpbody-content" ) ) . "\r\n"; 
  } 
 
  $wp_email = 'wordpress@' . preg_replace('#^www\.#', '', strtolower($_SERVER['SERVER_NAME'])); 
 
  if ( '' == $comment->comment_author ) { 
      $from = "From: \"$blogname\" <$wp_email>"; 
      if ( '' != $comment->comment_author_email ) 
          $reply_to = "Reply-To: $comment->comment_author_email"; 
  } else { 
      $from = "From: \"$comment->comment_author\" <$wp_email>"; 
      if ( '' != $comment->comment_author_email ) 
          $reply_to = "Reply-To: \"$comment->comment_author_email\" <$comment->comment_author_email>"; 
  } 
 
  $message_headers = "$from\n" 
      . "Content-Type: text/plain; charset=\"" . get_option('blog_charset') . "\"\n"; 
 
  if ( isset($reply_to) ) 
      $message_headers .= $reply_to . "\n"; 
 
  /** 
   * Filters the comment notification email text. 
   * 
   * @since 1.5.2 
   * 
   * @param string $notify_message The comment notification email text. 
   * @param int    $comment_id     Comment ID. 
   */ 
  $notify_message = apply_filters( 'comment_notification_text', $notify_message, $comment->comment_ID ); 
 
  /** 
   * Filters the comment notification email subject. 
   * 
   * @since 1.5.2 
   * 
   * @param string $subject    The comment notification email subject. 
   * @param int    $comment_id Comment ID. 
   */ 
  $subject = apply_filters( 'comment_notification_subject', $subject, $comment->comment_ID ); 
 
  /** 
   * Filters the comment notification email headers. 
   * 
   * @since 1.5.2 
   * 
   * @param string $message_headers Headers for the comment notification email. 
   * @param int    $comment_id      Comment ID. 
   */ 
  $message_headers = apply_filters( 'comment_notification_headers', $message_headers, $comment->comment_ID ); 
 
  foreach ( $emails as $email ) { 
      @wp_mail( $email, wp_specialchars_decode( $subject ), $notify_message, $message_headers ); 
  } 
 
  if ( $switched_locale ) { 
      restore_previous_locale(); 
  } 
 
  return true; 
} 
endif; 
 
if ( !function_exists('wp_notify_moderator') ) : 
/** 
 * Notifies the moderator of the site about a new comment that is awaiting approval. 
 * 
 * @since 1.0.0 
 * 
 * @global wpdb $wpdb WordPress database abstraction object. 
 * 
 * Uses the {@see 'notify_moderator'} filter to determine whether the site moderator 
 * should be notified, overriding the site setting. 
 * 
 * @param int $comment_id Comment ID. 
 * @return true Always returns true. 
 */ 
function wp_notify_moderator($comment_id) { 
  global $wpdb; 
 
  $maybe_notify = get_option( 'moderation_notify' ); 
 
  /** 
   * Filters whether to send the site moderator email notifications, overriding the site setting. 
   * 
   * @since 4.4.0 
   * 
   * @param bool $maybe_notify Whether to notify blog moderator. 
   * @param int  $comment_ID   The id of the comment for the notification. 
   */ 
  $maybe_notify = apply_filters( 'notify_moderator', $maybe_notify, $comment_id ); 
 
  if ( ! $maybe_notify ) { 
      return true; 
  } 
 
  $comment = get_comment($comment_id); 
  $post = get_post($comment->comment_post_ID); 
  $user = get_userdata( $post->post_author ); 
  // Send to the administration and to the post author if the author can modify the comment. 
  $emails = array( get_option( 'admin_email' ) ); 
  if ( $user && user_can( $user->ID, 'edit_comment', $comment_id ) && ! empty( $user->user_email ) ) { 
      if ( 0 !== strcasecmp( $user->user_email, get_option( 'admin_email' ) ) ) 
          $emails[] = $user->user_email; 
  } 
 
  $switched_locale = switch_to_locale( get_locale() ); 
 
  $comment_author_domain = @gethostbyaddr($comment->comment_author_IP); 
  $comments_waiting = $wpdb->get_var("SELECT count(comment_ID) FROM $wpdb->comments WHERE comment_approved = '0'"); 
 
  // The blogname option is escaped with esc_html on the way into the database in sanitize_option 
  // we want to reverse this for the plain text arena of emails. 
  $blogname = wp_specialchars_decode(get_option('blogname'), ENT_QUOTES); 
  $comment_content = wp_specialchars_decode( $comment->comment_content ); 
 
  switch ( $comment->comment_type ) { 
      case 'trackback': 
          /** translators: 1: Post title */ 
          $notify_message = sprintf( __('A new trackback on the post "%s" is waiting for your approval'), $post->post_title ) . "\r\n"; 
          $notify_message .= get_permalink($comment->comment_post_ID) . "\r\n\r\n"; 
          /** translators: 1: Trackback/pingback website name, 2: website IP, 3: website hostname */ 
          $notify_message .= sprintf( __( 'Website: %1$s (IP: %2$s, %3$s)' ), $comment->comment_author, $comment->comment_author_IP, $comment_author_domain ) . "\r\n"; 
          /** translators: 1: Trackback/pingback/comment author URL */ 
          $notify_message .= sprintf( __( 'URL: %s' ), $comment->comment_author_url ) . "\r\n"; 
          $notify_message .= __('Trackback excerpt: ') . "\r\n" . $comment_content . "\r\n\r\n"; 
          break; 
      case 'pingback': 
          /** translators: 1: Post title */ 
          $notify_message = sprintf( __('A new pingback on the post "%s" is waiting for your approval'), $post->post_title ) . "\r\n"; 
          $notify_message .= get_permalink($comment->comment_post_ID) . "\r\n\r\n"; 
          /** translators: 1: Trackback/pingback website name, 2: website IP, 3: website hostname */ 
          $notify_message .= sprintf( __( 'Website: %1$s (IP: %2$s, %3$s)' ), $comment->comment_author, $comment->comment_author_IP, $comment_author_domain ) . "\r\n"; 
          /** translators: 1: Trackback/pingback/comment author URL */ 
          $notify_message .= sprintf( __( 'URL: %s' ), $comment->comment_author_url ) . "\r\n"; 
          $notify_message .= __('Pingback excerpt: ') . "\r\n" . $comment_content . "\r\n\r\n"; 
          break; 
      default: // Comments 
          /** translators: 1: Post title */ 
          $notify_message = sprintf( __('A new comment on the post "%s" is waiting for your approval'), $post->post_title ) . "\r\n"; 
          $notify_message .= get_permalink($comment->comment_post_ID) . "\r\n\r\n"; 
          /** translators: 1: Comment author name, 2: comment author's IP, 3: comment author IP's hostname */ 
          $notify_message .= sprintf( __( 'Author: %1$s (IP: %2$s, %3$s)' ), $comment->comment_author, $comment->comment_author_IP, $comment_author_domain ) . "\r\n"; 
          /** translators: 1: Comment author URL */ 
          $notify_message .= sprintf( __( 'Email: %s' ), $comment->comment_author_email ) . "\r\n"; 
          /** translators: 1: Trackback/pingback/comment author URL */ 
          $notify_message .= sprintf( __( 'URL: %s' ), $comment->comment_author_url ) . "\r\n"; 
          /** translators: 1: Comment text */ 
          $notify_message .= sprintf( __( 'Comment: %s' ), "\r\n" . $comment_content ) . "\r\n\r\n"; 
          break; 
  } 
 
  /** translators: Comment moderation. 1: Comment action URL */ 
  $notify_message .= sprintf( __( 'Approve it: %s' ), admin_url( "comment.php?action=approve&c={$comment_id}#wpbody-content" ) ) . "\r\n"; 
 
  if ( EMPTY_TRASH_DAYS ) { 
      /** translators: Comment moderation. 1: Comment action URL */ 
      $notify_message .= sprintf( __( 'Trash it: %s' ), admin_url( "comment.php?action=trash&c={$comment_id}#wpbody-content" ) ) . "\r\n"; 
  } else { 
      /** translators: Comment moderation. 1: Comment action URL */ 
      $notify_message .= sprintf( __( 'Delete it: %s' ), admin_url( "comment.php?action=delete&c={$comment_id}#wpbody-content" ) ) . "\r\n"; 
  } 
 
  /** translators: Comment moderation. 1: Comment action URL */ 
  $notify_message .= sprintf( __( 'Spam it: %s' ), admin_url( "comment.php?action=spam&c={$comment_id}#wpbody-content" ) ) . "\r\n"; 
 
  /** translators: Comment moderation. 1: Number of comments awaiting approval */ 
  $notify_message .= sprintf( _n('Currently %s comment is waiting for approval. Please visit the moderation panel:',  
       'Currently %s comments are waiting for approval. Please visit the moderation panel:', $comments_waiting), number_format_i18n($comments_waiting) ) . "\r\n"; 
  $notify_message .= admin_url( "edit-comments.php?comment_status=moderated#wpbody-content" ) . "\r\n"; 
 
  /** translators: Comment moderation notification email subject. 1: Site name, 2: Post title */ 
  $subject = sprintf( __('[%1$s] Please moderate: "%2$s"'), $blogname, $post->post_title ); 
  $message_headers = ''; 
 
  /** 
   * Filters the list of recipients for comment moderation emails. 
   * 
   * @since 3.7.0 
   * 
   * @param array $emails     List of email addresses to notify for comment moderation. 
   * @param int   $comment_id Comment ID. 
   */ 
  $emails = apply_filters( 'comment_moderation_recipients', $emails, $comment_id ); 
 
  /** 
   * Filters the comment moderation email text. 
   * 
   * @since 1.5.2 
   * 
   * @param string $notify_message Text of the comment moderation email. 
   * @param int    $comment_id     Comment ID. 
   */ 
  $notify_message = apply_filters( 'comment_moderation_text', $notify_message, $comment_id ); 
 
  /** 
   * Filters the comment moderation email subject. 
   * 
   * @since 1.5.2 
   * 
   * @param string $subject    Subject of the comment moderation email. 
   * @param int    $comment_id Comment ID. 
   */ 
  $subject = apply_filters( 'comment_moderation_subject', $subject, $comment_id ); 
 
  /** 
   * Filters the comment moderation email headers. 
   * 
   * @since 2.8.0 
   * 
   * @param string $message_headers Headers for the comment moderation email. 
   * @param int    $comment_id      Comment ID. 
   */ 
  $message_headers = apply_filters( 'comment_moderation_headers', $message_headers, $comment_id ); 
 
  foreach ( $emails as $email ) { 
      @wp_mail( $email, wp_specialchars_decode( $subject ), $notify_message, $message_headers ); 
  } 
 
  if ( $switched_locale ) { 
      restore_previous_locale(); 
  } 
 
  return true; 
} 
endif; 
 
if ( !function_exists('wp_password_change_notification') ) : 
/** 
 * Notify the blog admin of a user changing password, normally via email. 
 * 
 * @since 2.7.0 
 * 
 * @param WP_User $user User object. 
 */ 
function wp_password_change_notification( $user ) { 
  // send a copy of password change notification to the admin 
  // but check to see if it's the admin whose password we're changing, and skip this 
  if ( 0 !== strcasecmp( $user->user_email, get_option( 'admin_email' ) ) ) { 
      /** translators: %s: user name */ 
      $message = sprintf( __( 'Password changed for user: %s' ), $user->user_login ) . "\r\n"; 
      // The blogname option is escaped with esc_html on the way into the database in sanitize_option 
      // we want to reverse this for the plain text arena of emails. 
      $blogname = wp_specialchars_decode(get_option('blogname'), ENT_QUOTES); 
      /** translators: %s: site title */ 
      wp_mail( get_option( 'admin_email' ), sprintf( __( '[%s] Password Changed' ), $blogname ), $message ); 
  } 
} 
endif; 
 
if ( !function_exists('wp_new_user_notification') ) : 
/** 
 * Email login credentials to a newly-registered user. 
 * 
 * A new user registration notification is also sent to admin email. 
 * 
 * @since 2.0.0 
 * @since 4.3.0 The `$plaintext_pass` parameter was changed to `$notify`. 
 * @since 4.3.1 The `$plaintext_pass` parameter was deprecated. `$notify` added as a third parameter. 
 * @since 4.6.0 The `$notify` parameter accepts 'user' for sending notification only to the user created. 
 * 
 * @global wpdb         $wpdb      WordPress database object for queries. 
 * @global PasswordHash $wp_hasher Portable PHP password hashing framework instance. 
 * 
 * @param int    $user_id    User ID. 
 * @param null   $deprecated Not used (argument deprecated). 
 * @param string $notify     Optional. Type of notification that should happen. Accepts 'admin' or an empty 
 *                           string (admin only), 'user', or 'both' (admin and user). Default empty. 
 */ 
function wp_new_user_notification( $user_id, $deprecated = null, $notify = '' ) { 
  if ( $deprecated !== null ) { 
      _deprecated_argument( __FUNCTION__, '4.3.1' ); 
  } 
 
  global $wpdb, $wp_hasher; 
  $user = get_userdata( $user_id ); 
 
  // The blogname option is escaped with esc_html on the way into the database in sanitize_option 
  // we want to reverse this for the plain text arena of emails. 
  $blogname = wp_specialchars_decode(get_option('blogname'), ENT_QUOTES); 
 
  if ( 'user' !== $notify ) { 
      $switched_locale = switch_to_locale( get_locale() ); 
      $message = sprintf( __( 'New user registration on your site %s:' ), $blogname ) . "\r\n\r\n"; 
      $message .= sprintf( __( 'Username: %s' ), $user->user_login ) . "\r\n\r\n"; 
      $message .= sprintf( __( 'Email: %s' ), $user->user_email ) . "\r\n"; 
 
      @wp_mail( get_option( 'admin_email' ), sprintf( __( '[%s] New User Registration' ), $blogname ), $message ); 
 
      if ( $switched_locale ) { 
          restore_previous_locale(); 
      } 
  } 
 
  // `$deprecated was pre-4.3 `$plaintext_pass`. An empty `$plaintext_pass` didn't sent a user notification. 
  if ( 'admin' === $notify || ( empty( $deprecated ) && empty( $notify ) ) ) { 
      return; 
  } 
 
  // Generate something random for a password reset key. 
  $key = wp_generate_password( 20, false ); 
 
  /** This action is documented in wp-login.php */ 
  do_action( 'retrieve_password_key', $user->user_login, $key ); 
 
  // Now insert the key, hashed, into the DB. 
  if ( empty( $wp_hasher ) ) { 
      $wp_hasher = new PasswordHash( 8, true ); 
  } 
  $hashed = time() . ':' . $wp_hasher->HashPassword( $key ); 
  $wpdb->update( $wpdb->users, array( 'user_activation_key' => $hashed ), array( 'user_login' => $user->user_login ) ); 
 
  $switched_locale = switch_to_locale( get_user_locale( $user ) ); 
 
  $message = sprintf(__('Username: %s'), $user->user_login) . "\r\n\r\n"; 
  $message .= __('To set your password, visit the following address:') . "\r\n\r\n"; 
  $message .= '<' . network_site_url("wp-login.php?action=rp&key=$key&login=" . rawurlencode($user->user_login), 'login') . ">\r\n\r\n"; 
 
  $message .= wp_login_url() . "\r\n"; 
 
  wp_mail($user->user_email, sprintf(__('[%s] Your username and password info'), $blogname), $message); 
 
  if ( $switched_locale ) { 
      restore_previous_locale(); 
  } 
} 
endif; 
 
if ( !function_exists('wp_nonce_tick') ) : 
/** 
 * Get the time-dependent variable for nonce creation. 
 * 
 * A nonce has a lifespan of two ticks. Nonces in their second tick may be 
 * updated, e.g. by autosave. 
 * 
 * @since 2.5.0 
 * 
 * @return float Float value rounded up to the next highest integer. 
 */ 
function wp_nonce_tick() { 
  /** 
   * Filters the lifespan of nonces in seconds. 
   * 
   * @since 2.5.0 
   * 
   * @param int $lifespan Lifespan of nonces in seconds. Default 86, 400 seconds, or one day. 
   */ 
  $nonce_life = apply_filters( 'nonce_life', DAY_IN_SECONDS ); 
 
  return ceil(time() / ( $nonce_life / 2 )); 
} 
endif; 
 
if ( !function_exists('wp_verify_nonce') ) : 
/** 
 * Verify that correct nonce was used with time limit. 
 * 
 * The user is given an amount of time to use the token, so therefore, since the 
 * UID and $action remain the same, the independent variable is the time. 
 * 
 * @since 2.0.3 
 * 
 * @param string     $nonce  Nonce that was used in the form to verify 
 * @param string|int $action Should give context to what is taking place and be the same when nonce was created. 
 * @return false|int False if the nonce is invalid, 1 if the nonce is valid and generated between 
 *                   0-12 hours ago, 2 if the nonce is valid and generated between 12-24 hours ago. 
 */ 
function wp_verify_nonce( $nonce, $action = -1 ) { 
  $nonce = (string) $nonce; 
  $user = wp_get_current_user(); 
  $uid = (int) $user->ID; 
  if ( ! $uid ) { 
      /** 
       * Filters whether the user who generated the nonce is logged out. 
       * 
       * @since 3.5.0 
       * 
       * @param int    $uid    ID of the nonce-owning user. 
       * @param string $action The nonce action. 
       */ 
      $uid = apply_filters( 'nonce_user_logged_out', $uid, $action ); 
  } 
 
  if ( empty( $nonce ) ) { 
      return false; 
  } 
 
  $token = wp_get_session_token(); 
  $i = wp_nonce_tick(); 
 
  // Nonce generated 0-12 hours ago 
  $expected = substr( wp_hash( $i . '|' . $action . '|' . $uid . '|' . $token, 'nonce'), -12, 10 ); 
  if ( hash_equals( $expected, $nonce ) ) { 
      return 1; 
  } 
 
  // Nonce generated 12-24 hours ago 
  $expected = substr( wp_hash( ( $i - 1 ) . '|' . $action . '|' . $uid . '|' . $token, 'nonce' ), -12, 10 ); 
  if ( hash_equals( $expected, $nonce ) ) { 
      return 2; 
  } 
 
  /** 
   * Fires when nonce verification fails. 
   * 
   * @since 4.4.0 
   * 
   * @param string     $nonce  The invalid nonce. 
   * @param string|int $action The nonce action. 
   * @param WP_User    $user   The current user object. 
   * @param string     $token  The user's session token. 
   */ 
  do_action( 'wp_verify_nonce_failed', $nonce, $action, $user, $token ); 
 
  // Invalid nonce 
  return false; 
} 
endif; 
 
if ( !function_exists('wp_create_nonce') ) : 
/** 
 * Creates a cryptographic token tied to a specific action, user, user session,  
 * and window of time. 
 * 
 * @since 2.0.3 
 * @since 4.0.0 Session tokens were integrated with nonce creation 
 * 
 * @param string|int $action Scalar value to add context to the nonce. 
 * @return string The token. 
 */ 
function wp_create_nonce($action = -1) { 
  $user = wp_get_current_user(); 
  $uid = (int) $user->ID; 
  if ( ! $uid ) { 
      /** This filter is documented in wp-includes/pluggable.php */ 
      $uid = apply_filters( 'nonce_user_logged_out', $uid, $action ); 
  } 
 
  $token = wp_get_session_token(); 
  $i = wp_nonce_tick(); 
 
  return substr( wp_hash( $i . '|' . $action . '|' . $uid . '|' . $token, 'nonce' ), -12, 10 ); 
} 
endif; 
 
if ( !function_exists('wp_salt') ) : 
/** 
 * Get salt to add to hashes. 
 * 
 * Salts are created using secret keys. Secret keys are located in two places: 
 * in the database and in the wp-config.php file. The secret key in the database 
 * is randomly generated and will be appended to the secret keys in wp-config.php. 
 * 
 * The secret keys in wp-config.php should be updated to strong, random keys to maximize 
 * security. Below is an example of how the secret key constants are defined. 
 * Do not paste this example directly into wp-config.php. Instead, have a 
 * {@link https://api.wordpress.org/secret-key/1.1/salt/ secret key created} just 
 * for you. 
 * 
 *     define('AUTH_KEY', ' Xakm<o xQy rw4EMsLKM-?!T+, PFF})H4lzcW57AF0U@N@< >M%G4Yt>f`z]MON'); 
 *     define('SECURE_AUTH_KEY', 'LzJ}op]mr|6+![P}Ak:uNdJCJZd>(Hx.-Mh#Tz)pCIU#uGEnfFz|f ;;eU%/U^O~'); 
 *     define('LOGGED_IN_KEY', '|i|Ux`9<p-h$aFf(qnT:sDO:D1P^wZ$$/Ra@miTJi9G;ddp_<q}6H1)o|a +&JCM'); 
 *     define('NONCE_KEY', '%:R{[P|, s.KuMltH5}cI;/k<Gx~j!f0I)m_sIyu+&NJZ)-iO>z7X>QYR0Z_XnZ@|'); 
 *     define('AUTH_SALT', 'eZyT)-Naw]F8CwA*VaW#q*|.)g@o}||wf~@C-YSt}(dh_r6EbI#A, y|nU2{B#JBW'); 
 *     define('SECURE_AUTH_SALT', '!=oLUTXh, QW=H `}`L|9/^4-3 STz}, T(w}W<I`.JjPi)<Bmf1v, HpGe}T1:Xt7n'); 
 *     define('LOGGED_IN_SALT', '+XSqHc;@Q*K_b|Z?NC[3H!!EONbh.n<+=uKR:>*c(u`g~EJBf#8u#R{mUEZrozmm'); 
 *     define('NONCE_SALT', 'h`GXHhD>SLWVfg1(1(N{;.V!MoE(SfbA_ksP@&`+AycHcAV$+?@3q+rxV{%^VyKT'); 
 * 
 * Salting passwords helps against tools which has stored hashed values of 
 * common dictionary strings. The added values makes it harder to crack. 
 * 
 * @since 2.5.0 
 * 
 * @link https://api.wordpress.org/secret-key/1.1/salt/ Create secrets for wp-config.php 
 * 
 * @staticvar array $cached_salts 
 * @staticvar array $duplicated_keys 
 * 
 * @param string $scheme Authentication scheme (auth, secure_auth, logged_in, nonce) 
 * @return string Salt value 
 */ 
function wp_salt( $scheme = 'auth' ) { 
  static $cached_salts = array(); 
  if ( isset( $cached_salts[ $scheme ] ) ) { 
      /** 
       * Filters the WordPress salt. 
       * 
       * @since 2.5.0 
       * 
       * @param string $cached_salt Cached salt for the given scheme. 
       * @param string $scheme      Authentication scheme. Values include 'auth',  
       *                            'secure_auth', 'logged_in', and 'nonce'. 
       */ 
      return apply_filters( 'salt', $cached_salts[ $scheme ], $scheme ); 
  } 
 
  static $duplicated_keys; 
  if ( null === $duplicated_keys ) { 
      $duplicated_keys = array( 'put your unique phrase here' => true ); 
      foreach ( array( 'AUTH', 'SECURE_AUTH', 'LOGGED_IN', 'NONCE', 'SECRET' ) as $first ) { 
          foreach ( array( 'KEY', 'SALT' ) as $second ) { 
              if ( ! defined( "{$first}_{$second}" ) ) { 
                  continue; 
              } 
              $value = constant( "{$first}_{$second}" ); 
              $duplicated_keys[ $value ] = isset( $duplicated_keys[ $value ] ); 
          } 
      } 
  } 
 
  $values = array( 
      'key' => '',  
      'salt' => '' 
 ); 
  if ( defined( 'SECRET_KEY' ) && SECRET_KEY && empty( $duplicated_keys[ SECRET_KEY ] ) ) { 
      $values['key'] = SECRET_KEY; 
  } 
  if ( 'auth' == $scheme && defined( 'SECRET_SALT' ) && SECRET_SALT && empty( $duplicated_keys[ SECRET_SALT ] ) ) { 
      $values['salt'] = SECRET_SALT; 
  } 
 
  if ( in_array( $scheme, array( 'auth', 'secure_auth', 'logged_in', 'nonce' ) ) ) { 
      foreach ( array( 'key', 'salt' ) as $type ) { 
          $const = strtoupper( "{$scheme}_{$type}" ); 
          if ( defined( $const ) && constant( $const ) && empty( $duplicated_keys[ constant( $const ) ] ) ) { 
              $values[ $type ] = constant( $const ); 
          } elseif ( ! $values[ $type ] ) { 
              $values[ $type ] = get_site_option( "{$scheme}_{$type}" ); 
              if ( ! $values[ $type ] ) { 
                  $values[ $type ] = wp_generate_password( 64, true, true ); 
                  update_site_option( "{$scheme}_{$type}", $values[ $type ] ); 
              } 
          } 
      } 
  } else { 
      if ( ! $values['key'] ) { 
          $values['key'] = get_site_option( 'secret_key' ); 
          if ( ! $values['key'] ) { 
              $values['key'] = wp_generate_password( 64, true, true ); 
              update_site_option( 'secret_key', $values['key'] ); 
          } 
      } 
      $values['salt'] = hash_hmac( 'md5', $scheme, $values['key'] ); 
  } 
 
  $cached_salts[ $scheme ] = $values['key'] . $values['salt']; 
 
  /** This filter is documented in wp-includes/pluggable.php */ 
  return apply_filters( 'salt', $cached_salts[ $scheme ], $scheme ); 
} 
endif; 
 
if ( !function_exists('wp_hash') ) : 
/** 
 * Get hash of given string. 
 * 
 * @since 2.0.3 
 * 
 * @param string $data   Plain text to hash 
 * @param string $scheme Authentication scheme (auth, secure_auth, logged_in, nonce) 
 * @return string Hash of $data 
 */ 
function wp_hash($data, $scheme = 'auth') { 
  $salt = wp_salt($scheme); 
 
  return hash_hmac('md5', $data, $salt); 
} 
endif; 
 
if ( !function_exists('wp_hash_password') ) : 
/** 
 * Create a hash (encrypt) of a plain text password. 
 * 
 * For integration with other applications, this function can be overwritten to 
 * instead use the other package password checking algorithm. 
 * 
 * @since 2.5.0 
 * 
 * @global PasswordHash $wp_hasher PHPass object 
 * 
 * @param string $password Plain text user password to hash 
 * @return string The hash string of the password 
 */ 
function wp_hash_password($password) { 
  global $wp_hasher; 
 
  if ( empty($wp_hasher) ) { 
      // By default, use the portable hash from phpass 
      $wp_hasher = new PasswordHash(8, true); 
  } 
 
  return $wp_hasher->HashPassword( trim( $password ) ); 
} 
endif; 
 
if ( !function_exists('wp_check_password') ) : 
/** 
 * Checks the plaintext password against the encrypted Password. 
 * 
 * Maintains compatibility between old version and the new cookie authentication 
 * protocol using PHPass library. The $hash parameter is the encrypted password 
 * and the function compares the plain text password when encrypted similarly 
 * against the already encrypted password to see if they match. 
 * 
 * For integration with other applications, this function can be overwritten to 
 * instead use the other package password checking algorithm. 
 * 
 * @since 2.5.0 
 * 
 * @global PasswordHash $wp_hasher PHPass object used for checking the password 
 *    against the $hash + $password 
 * @uses PasswordHash::CheckPassword 
 * 
 * @param string     $password Plaintext user's password 
 * @param string     $hash     Hash of the user's password to check against. 
 * @param string|int $user_id  Optional. User ID. 
 * @return bool False, if the $password does not match the hashed password 
 */ 
function wp_check_password($password, $hash, $user_id = '') { 
  global $wp_hasher; 
 
  // If the hash is still md5... 
  if ( strlen($hash) <= 32 ) { 
      $check = hash_equals( $hash, md5( $password ) ); 
      if ( $check && $user_id ) { 
          // Rehash using new hash. 
          wp_set_password($password, $user_id); 
          $hash = wp_hash_password($password); 
      } 
 
      /** 
       * Filters whether the plaintext password matches the encrypted password. 
       * 
       * @since 2.5.0 
       * 
       * @param bool       $check    Whether the passwords match. 
       * @param string     $password The plaintext password. 
       * @param string     $hash     The hashed password. 
       * @param string|int $user_id  User ID. Can be empty. 
       */ 
      return apply_filters( 'check_password', $check, $password, $hash, $user_id ); 
  } 
 
  // If the stored hash is longer than an MD5, presume the 
  // new style phpass portable hash. 
  if ( empty($wp_hasher) ) { 
      // By default, use the portable hash from phpass 
      $wp_hasher = new PasswordHash(8, true); 
  } 
 
  $check = $wp_hasher->CheckPassword($password, $hash); 
 
  /** This filter is documented in wp-includes/pluggable.php */ 
  return apply_filters( 'check_password', $check, $password, $hash, $user_id ); 
} 
endif; 
 
if ( !function_exists('wp_generate_password') ) : 
/** 
 * Generates a random password drawn from the defined set of characters. 
 * 
 * @since 2.5.0 
 * 
 * @param int  $length              Optional. The length of password to generate. Default 12. 
 * @param bool $special_chars       Optional. Whether to include standard special characters. 
 *                                  Default true. 
 * @param bool $extra_special_chars Optional. Whether to include other special characters. 
 *                                  Used when generating secret keys and salts. Default false. 
 * @return string The random password. 
 */ 
function wp_generate_password( $length = 12, $special_chars = true, $extra_special_chars = false ) { 
  $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'; 
  if ( $special_chars ) 
      $chars .= '!@#$%^&*()'; 
  if ( $extra_special_chars ) 
      $chars .= '-_ []{}<>~`+=, .;:/?|'; 
 
  $password = ''; 
  for ( $i = 0; $i < $length; $i++ ) { 
      $password .= substr($chars, wp_rand(0, strlen($chars) - 1), 1); 
  } 
 
  /** 
   * Filters the randomly-generated password. 
   * 
   * @since 3.0.0 
   * 
   * @param string $password The generated password. 
   */ 
  return apply_filters( 'random_password', $password ); 
} 
endif; 
 
if ( !function_exists('wp_rand') ) : 
/** 
 * Generates a random number 
 * 
 * @since 2.6.2 
 * @since 4.4.0 Uses PHP7 random_int() or the random_compat library if available. 
 * 
 * @global string $rnd_value 
 * @staticvar string $seed 
 * @staticvar bool $external_rand_source_available 
 * 
 * @param int $min Lower limit for the generated number 
 * @param int $max Upper limit for the generated number 
 * @return int A random number between min and max 
 */ 
function wp_rand( $min = 0, $max = 0 ) { 
  global $rnd_value; 
 
  // Some misconfigured 32bit environments (Entropy PHP, for example) truncate integers larger than PHP_INT_MAX to PHP_INT_MAX rather than overflowing them to floats. 
  $max_random_number = 3000000000 === 2147483647 ? (float) "4294967295" : 4294967295; // 4294967295 = 0xffffffff 
 
  // We only handle Ints, floats are truncated to their integer value. 
  $min = (int) $min; 
  $max = (int) $max; 
 
  // Use PHP's CSPRNG, or a compatible method 
  static $use_random_int_functionality = true; 
  if ( $use_random_int_functionality ) { 
      try { 
          $_max = ( 0 != $max ) ? $max : $max_random_number; 
          // wp_rand() can accept arguments in either order, PHP cannot. 
          $_max = max( $min, $_max ); 
          $_min = min( $min, $_max ); 
          $val = random_int( $_min, $_max ); 
          if ( false !== $val ) { 
              return absint( $val ); 
          } else { 
              $use_random_int_functionality = false; 
          } 
      } catch ( Error $e ) { 
          $use_random_int_functionality = false; 
      } catch ( Exception $e ) { 
          $use_random_int_functionality = false; 
      } 
  } 
 
  // Reset $rnd_value after 14 uses 
  // 32(md5) + 40(sha1) + 40(sha1) / 8 = 14 random numbers from $rnd_value 
  if ( strlen($rnd_value) < 8 ) { 
      if ( defined( 'WP_SETUP_CONFIG' ) ) 
          static $seed = ''; 
      else 
          $seed = get_transient('random_seed'); 
      $rnd_value = md5( uniqid(microtime() . mt_rand(), true ) . $seed ); 
      $rnd_value .= sha1($rnd_value); 
      $rnd_value .= sha1($rnd_value . $seed); 
      $seed = md5($seed . $rnd_value); 
      if ( ! defined( 'WP_SETUP_CONFIG' ) && ! defined( 'WP_INSTALLING' ) ) { 
          set_transient( 'random_seed', $seed ); 
      } 
  } 
 
  // Take the first 8 digits for our value 
  $value = substr($rnd_value, 0, 8); 
 
  // Strip the first eight, leaving the remainder for the next call to wp_rand(). 
  $rnd_value = substr($rnd_value, 8); 
 
  $value = abs(hexdec($value)); 
 
  // Reduce the value to be within the min - max range 
  if ( $max != 0 ) 
      $value = $min + ( $max - $min + 1 ) * $value / ( $max_random_number + 1 ); 
 
  return abs(intval($value)); 
} 
endif; 
 
if ( !function_exists('wp_set_password') ) : 
/** 
 * Updates the user's password with a new encrypted one. 
 * 
 * For integration with other applications, this function can be overwritten to 
 * instead use the other package password checking algorithm. 
 * 
 * Please note: This function should be used sparingly and is really only meant for single-time 
 * application. Leveraging this improperly in a plugin or theme could result in an endless loop 
 * of password resets if precautions are not taken to ensure it does not execute on every page load. 
 * 
 * @since 2.5.0 
 * 
 * @global wpdb $wpdb WordPress database abstraction object. 
 * 
 * @param string $password The plaintext new user password 
 * @param int    $user_id  User ID 
 */ 
function wp_set_password( $password, $user_id ) { 
  global $wpdb; 
 
  $hash = wp_hash_password( $password ); 
  $wpdb->update($wpdb->users, array('user_pass' => $hash, 'user_activation_key' => ''), array('ID' => $user_id) ); 
 
  wp_cache_delete($user_id, 'users'); 
} 
endif; 
 
if ( !function_exists( 'get_avatar' ) ) : 
/** 
 * Retrieve the avatar `<img>` tag for a user, email address, MD5 hash, comment, or post. 
 * 
 * @since 2.5.0 
 * @since 4.2.0 Optional `$args` parameter added. 
 * 
 * @param mixed $id_or_email The Gravatar to retrieve. Accepts a user_id, gravatar md5 hash,  
 *                           user email, WP_User object, WP_Post object, or WP_Comment object. 
 * @param int    $size       Optional. Height and width of the avatar image file in pixels. Default 96. 
 * @param string $default    Optional. URL for the default image or a default type. Accepts '404' 
 *                           (return a 404 instead of a default image), 'retro' (8bit), 'monsterid' 
 *                           (monster), 'wavatar' (cartoon face), 'indenticon' (the "quilt"),  
 *                           'mystery', 'mm', or 'mysteryman' (The Oyster Man), 'blank' (transparent GIF),  
 *                           or 'gravatar_default' (the Gravatar logo). Default is the value of the 
 *                           'avatar_default' option, with a fallback of 'mystery'. 
 * @param string $alt        Optional. Alternative text to use in <img> tag. Default empty. 
 * @param array  $args       { 
 *     Optional. Extra arguments to retrieve the avatar. 
 * 
 *     @type int          $height        Display height of the avatar in pixels. Defaults to $size. 
 *     @type int          $width         Display width of the avatar in pixels. Defaults to $size. 
 *     @type bool         $force_default Whether to always show the default image, never the Gravatar. Default false. 
 *     @type string       $rating        What rating to display avatars up to. Accepts 'G', 'PG', 'R', 'X', and are 
 *                                       judged in that order. Default is the value of the 'avatar_rating' option. 
 *     @type string       $scheme        URL scheme to use. See set_url_scheme() for accepted values. 
 *                                       Default null. 
 *     @type array|string $class         Array or string of additional classes to add to the <img> element. 
 *                                       Default null. 
 *     @type bool         $force_display Whether to always show the avatar - ignores the show_avatars option. 
 *                                       Default false. 
 *     @type string       $extra_attr    HTML attributes to insert in the IMG element. Is not sanitized. Default empty. 
 * } 
 * @return false|string `<img>` tag for the user's avatar. False on failure. 
 */ 
function get_avatar( $id_or_email, $size = 96, $default = '', $alt = '', $args = null ) { 
  $defaults = array( 
      // get_avatar_data() args. 
      'size' => 96,  
      'height' => null,  
      'width' => null,  
      'default' => get_option( 'avatar_default', 'mystery' ),  
      'force_default' => false,  
      'rating' => get_option( 'avatar_rating' ),  
      'scheme' => null,  
      'alt' => '',  
      'class' => null,  
      'force_display' => false,  
      'extra_attr' => '',  
 ); 
 
  if ( empty( $args ) ) { 
      $args = array(); 
  } 
 
  $args['size'] = (int) $size; 
  $args['default'] = $default; 
  $args['alt'] = $alt; 
 
  $args = wp_parse_args( $args, $defaults ); 
 
  if ( empty( $args['height'] ) ) { 
      $args['height'] = $args['size']; 
  } 
  if ( empty( $args['width'] ) ) { 
      $args['width'] = $args['size']; 
  } 
 
  if ( is_object( $id_or_email ) && isset( $id_or_email->comment_ID ) ) { 
      $id_or_email = get_comment( $id_or_email ); 
  } 
 
  /** 
   * Filters whether to retrieve the avatar URL early. 
   * 
   * Passing a non-null value will effectively short-circuit get_avatar(), passing 
   * the value through the {@see 'get_avatar'} filter and returning early. 
   * 
   * @since 4.2.0 
   * 
   * @param string $avatar      HTML for the user's avatar. Default null. 
   * @param mixed  $id_or_email The Gravatar to retrieve. Accepts a user_id, gravatar md5 hash,  
   *                            user email, WP_User object, WP_Post object, or WP_Comment object. 
   * @param array  $args        Arguments passed to get_avatar_url(), after processing. 
   */ 
  $avatar = apply_filters( 'pre_get_avatar', null, $id_or_email, $args ); 
 
  if ( ! is_null( $avatar ) ) { 
      /** This filter is documented in wp-includes/pluggable.php */ 
      return apply_filters( 'get_avatar', $avatar, $id_or_email, $args['size'], $args['default'], $args['alt'], $args ); 
  } 
 
  if ( ! $args['force_display'] && ! get_option( 'show_avatars' ) ) { 
      return false; 
  } 
 
  $url2x = get_avatar_url( $id_or_email, array_merge( $args, array( 'size' => $args['size'] * 2 ) ) ); 
 
  $args = get_avatar_data( $id_or_email, $args ); 
 
  $url = $args['url']; 
 
  if ( ! $url || is_wp_error( $url ) ) { 
      return false; 
  } 
 
  $class = array( 'avatar', 'avatar-' . (int) $args['size'], 'photo' ); 
 
  if ( ! $args['found_avatar'] || $args['force_default'] ) { 
      $class[] = 'avatar-default'; 
  } 
 
  if ( $args['class'] ) { 
      if ( is_array( $args['class'] ) ) { 
          $class = array_merge( $class, $args['class'] ); 
      } else { 
          $class[] = $args['class']; 
      } 
  } 
 
  $avatar = sprintf( 
      "<img alt='%s' src='%s' srcset='%s' class='%s' height='%d' width='%d' %s/>",  
      esc_attr( $args['alt'] ),  
      esc_url( $url ),  
      esc_attr( "$url2x 2x" ),  
      esc_attr( join( ' ', $class ) ),  
      (int) $args['height'],  
      (int) $args['width'],  
      $args['extra_attr'] 
 ); 
 
  /** 
   * Filters the avatar to retrieve. 
   * 
   * @since 2.5.0 
   * @since 4.2.0 The `$args` parameter was added. 
   * 
   * @param string $avatar      <img> tag for the user's avatar. 
   * @param mixed  $id_or_email The Gravatar to retrieve. Accepts a user_id, gravatar md5 hash,  
   *                            user email, WP_User object, WP_Post object, or WP_Comment object. 
   * @param int    $size        Square avatar width and height in pixels to retrieve. 
   * @param string $alt         Alternative text to use in the avatar image tag. 
   *                                       Default empty. 
   * @param array  $args        Arguments passed to get_avatar_data(), after processing. 
   */ 
  return apply_filters( 'get_avatar', $avatar, $id_or_email, $args['size'], $args['default'], $args['alt'], $args ); 
} 
endif; 
 
if ( !function_exists( 'wp_text_diff' ) ) : 
/** 
 * Displays a human readable HTML representation of the difference between two strings. 
 * 
 * The Diff is available for getting the changes between versions. The output is 
 * HTML, so the primary use is for displaying the changes. If the two strings 
 * are equivalent, then an empty string will be returned. 
 * 
 * The arguments supported and can be changed are listed below. 
 * 
 * 'title' : Default is an empty string. Titles the diff in a manner compatible 
 *        with the output. 
 * 'title_left' : Default is an empty string. Change the HTML to the left of the 
 *        title. 
 * 'title_right' : Default is an empty string. Change the HTML to the right of 
 *        the title. 
 * 
 * @since 2.6.0 
 * 
 * @see wp_parse_args() Used to change defaults to user defined settings. 
 * @uses Text_Diff 
 * @uses WP_Text_Diff_Renderer_Table 
 * 
 * @param string       $left_string  "old" (left) version of string 
 * @param string       $right_string "new" (right) version of string 
 * @param string|array $args         Optional. Change 'title', 'title_left', and 'title_right' defaults. 
 * @return string Empty string if strings are equivalent or HTML with differences. 
 */ 
function wp_text_diff( $left_string, $right_string, $args = null ) { 
  $defaults = array( 'title' => '', 'title_left' => '', 'title_right' => '' ); 
  $args = wp_parse_args( $args, $defaults ); 
 
  if ( ! class_exists( 'WP_Text_Diff_Renderer_Table', false ) ) 
      require( ABSPATH . WPINC . '/wp-diff.php' ); 
 
  $left_string = normalize_whitespace($left_string); 
  $right_string = normalize_whitespace($right_string); 
 
  $left_lines = explode("\n", $left_string); 
  $right_lines = explode("\n", $right_string); 
  $text_diff = new Text_Diff($left_lines, $right_lines); 
  $renderer = new WP_Text_Diff_Renderer_Table( $args ); 
  $diff = $renderer->render($text_diff); 
 
  if ( !$diff ) 
      return ''; 
 
  $r = "<table class='diff'>\n"; 
 
  if ( ! empty( $args[ 'show_split_view' ] ) ) { 
      $r .= "<col class='content diffsplit left' /><col class='content diffsplit middle' /><col class='content diffsplit right' />"; 
  } else { 
      $r .= "<col class='content' />"; 
  } 
 
  if ( $args['title'] || $args['title_left'] || $args['title_right'] ) 
      $r .= "<thead>"; 
  if ( $args['title'] ) 
      $r .= "<tr class='diff-title'><th colspan='4'>$args[title]</th></tr>\n"; 
  if ( $args['title_left'] || $args['title_right'] ) { 
      $r .= "<tr class='diff-sub-title'>\n"; 
      $r .= "\t<td></td><th>$args[title_left]</th>\n"; 
      $r .= "\t<td></td><th>$args[title_right]</th>\n"; 
      $r .= "</tr>\n"; 
  } 
  if ( $args['title'] || $args['title_left'] || $args['title_right'] ) 
      $r .= "</thead>\n"; 
 
  $r .= "<tbody>\n$diff\n</tbody>\n"; 
  $r .= "</table>"; 
 
  return $r; 
} 
endif;