/wp-includes/ms-functions.php

<?php 
/** 
 * Multisite WordPress API 
 * 
 * @package WordPress 
 * @subpackage Multisite 
 * @since 3.0.0 
 */ 
 
/** 
 * Gets the network's site and user counts. 
 * 
 * @since MU 1.0 
 * 
 * @return array Site and user count for the network. 
 */ 
function get_sitestats() { 
  $stats = array( 
      'blogs' => get_blog_count(),  
      'users' => get_user_count(),  
 ); 
 
  return $stats; 
} 
 
/** 
 * Get one of a user's active blogs 
 * 
 * Returns the user's primary blog, if they have one and 
 * it is active. If it's inactive, function returns another 
 * active blog of the user. If none are found, the user 
 * is added as a Subscriber to the Dashboard Blog and that blog 
 * is returned. 
 * 
 * @since MU 1.0 
 * 
 * @global wpdb $wpdb WordPress database abstraction object. 
 * 
 * @param int $user_id The unique ID of the user 
 * @return WP_Site|void The blog object 
 */ 
function get_active_blog_for_user( $user_id ) { 
  global $wpdb; 
  $blogs = get_blogs_of_user( $user_id ); 
  if ( empty( $blogs ) ) 
      return; 
 
  if ( !is_multisite() ) 
      return $blogs[$wpdb->blogid]; 
 
  $primary_blog = get_user_meta( $user_id, 'primary_blog', true ); 
  $first_blog = current($blogs); 
  if ( false !== $primary_blog ) { 
      if ( ! isset( $blogs[ $primary_blog ] ) ) { 
          update_user_meta( $user_id, 'primary_blog', $first_blog->userblog_id ); 
          $primary = get_site( $first_blog->userblog_id ); 
      } else { 
          $primary = get_site( $primary_blog ); 
      } 
  } else { 
      //TODO Review this call to add_user_to_blog too - to get here the user must have a role on this blog? 
      add_user_to_blog( $first_blog->userblog_id, $user_id, 'subscriber' ); 
      update_user_meta( $user_id, 'primary_blog', $first_blog->userblog_id ); 
      $primary = $first_blog; 
  } 
 
  if ( ( ! is_object( $primary ) ) || ( $primary->archived == 1 || $primary->spam == 1 || $primary->deleted == 1 ) ) { 
      $blogs = get_blogs_of_user( $user_id, true ); // if a user's primary blog is shut down, check their other blogs. 
      $ret = false; 
      if ( is_array( $blogs ) && count( $blogs ) > 0 ) { 
          foreach ( (array) $blogs as $blog_id => $blog ) { 
              if ( $blog->site_id != $wpdb->siteid ) 
                  continue; 
              $details = get_site( $blog_id ); 
              if ( is_object( $details ) && $details->archived == 0 && $details->spam == 0 && $details->deleted == 0 ) { 
                  $ret = $blog; 
                  if ( get_user_meta( $user_id , 'primary_blog', true ) != $blog_id ) 
                      update_user_meta( $user_id, 'primary_blog', $blog_id ); 
                  if ( !get_user_meta($user_id , 'source_domain', true) ) 
                      update_user_meta( $user_id, 'source_domain', $blog->domain ); 
                  break; 
              } 
          } 
      } else { 
          return; 
      } 
      return $ret; 
  } else { 
      return $primary; 
  } 
} 
 
/** 
 * The number of active users in your installation. 
 * 
 * The count is cached and updated twice daily. This is not a live count. 
 * 
 * @since MU 2.7 
 * 
 * @return int 
 */ 
function get_user_count() { 
  return get_site_option( 'user_count' ); 
} 
 
/** 
 * The number of active sites on your installation. 
 * 
 * The count is cached and updated twice daily. This is not a live count. 
 * 
 * @since MU 1.0 
 * 
 * @param int $network_id Deprecated, not supported. 
 * @return int 
 */ 
function get_blog_count( $network_id = 0 ) { 
  if ( func_num_args() ) 
      _deprecated_argument( __FUNCTION__, '3.1.0' ); 
 
  return get_site_option( 'blog_count' ); 
} 
 
/** 
 * Get a blog post from any site on the network. 
 * 
 * @since MU 1.0 
 * 
 * @param int $blog_id ID of the blog. 
 * @param int $post_id ID of the post you're looking for. 
 * @return WP_Post|null WP_Post on success or null on failure 
 */ 
function get_blog_post( $blog_id, $post_id ) { 
  switch_to_blog( $blog_id ); 
  $post = get_post( $post_id ); 
  restore_current_blog(); 
 
  return $post; 
} 
 
/** 
 * Adds a user to a blog. 
 * 
 * Use the {@see 'add_user_to_blog'} action to fire an event when users are added to a blog. 
 * 
 * @since MU 1.0 
 * 
 * @param int    $blog_id ID of the blog you're adding the user to. 
 * @param int    $user_id ID of the user you're adding. 
 * @param string $role    The role you want the user to have 
 * @return true|WP_Error 
 */ 
function add_user_to_blog( $blog_id, $user_id, $role ) { 
  switch_to_blog($blog_id); 
 
  $user = get_userdata( $user_id ); 
 
  if ( ! $user ) { 
      restore_current_blog(); 
      return new WP_Error( 'user_does_not_exist', __( 'The requested user does not exist.' ) ); 
  } 
 
  if ( !get_user_meta($user_id, 'primary_blog', true) ) { 
      update_user_meta($user_id, 'primary_blog', $blog_id); 
      $site = get_site( $blog_id ); 
      update_user_meta( $user_id, 'source_domain', $site->domain ); 
  } 
 
  $user->set_role($role); 
 
  /** 
   * Fires immediately after a user is added to a site. 
   * 
   * @since MU 
   * 
   * @param int    $user_id User ID. 
   * @param string $role    User role. 
   * @param int    $blog_id Blog ID. 
   */ 
  do_action( 'add_user_to_blog', $user_id, $role, $blog_id ); 
  wp_cache_delete( $user_id, 'users' ); 
  wp_cache_delete( $blog_id . '_user_count', 'blog-details' ); 
  restore_current_blog(); 
  return true; 
} 
 
/** 
 * Remove a user from a blog. 
 * 
 * Use the {@see 'remove_user_from_blog'} action to fire an event when 
 * users are removed from a blog. 
 * 
 * Accepts an optional `$reassign` parameter, if you want to 
 * reassign the user's blog posts to another user upon removal. 
 * 
 * @since MU 1.0 
 * 
 * @global wpdb $wpdb WordPress database abstraction object. 
 * 
 * @param int    $user_id  ID of the user you're removing. 
 * @param int    $blog_id  ID of the blog you're removing the user from. 
 * @param string $reassign Optional. A user to whom to reassign posts. 
 * @return true|WP_Error 
 */ 
function remove_user_from_blog($user_id, $blog_id = '', $reassign = '') { 
  global $wpdb; 
  switch_to_blog($blog_id); 
  $user_id = (int) $user_id; 
  /** 
   * Fires before a user is removed from a site. 
   * 
   * @since MU 
   * 
   * @param int $user_id User ID. 
   * @param int $blog_id Blog ID. 
   */ 
  do_action( 'remove_user_from_blog', $user_id, $blog_id ); 
 
  // If being removed from the primary blog, set a new primary if the user is assigned 
  // to multiple blogs. 
  $primary_blog = get_user_meta($user_id, 'primary_blog', true); 
  if ( $primary_blog == $blog_id ) { 
      $new_id = ''; 
      $new_domain = ''; 
      $blogs = get_blogs_of_user($user_id); 
      foreach ( (array) $blogs as $blog ) { 
          if ( $blog->userblog_id == $blog_id ) 
              continue; 
          $new_id = $blog->userblog_id; 
          $new_domain = $blog->domain; 
          break; 
      } 
 
      update_user_meta($user_id, 'primary_blog', $new_id); 
      update_user_meta($user_id, 'source_domain', $new_domain); 
  } 
 
  // wp_revoke_user($user_id); 
  $user = get_userdata( $user_id ); 
  if ( ! $user ) { 
      restore_current_blog(); 
      return new WP_Error('user_does_not_exist', __('That user does not exist.')); 
  } 
 
  $user->remove_all_caps(); 
 
  $blogs = get_blogs_of_user($user_id); 
  if ( count($blogs) == 0 ) { 
      update_user_meta($user_id, 'primary_blog', ''); 
      update_user_meta($user_id, 'source_domain', ''); 
  } 
 
  if ( $reassign != '' ) { 
      $reassign = (int) $reassign; 
      $post_ids = $wpdb->get_col( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE post_author = %d", $user_id ) ); 
      $link_ids = $wpdb->get_col( $wpdb->prepare( "SELECT link_id FROM $wpdb->links WHERE link_owner = %d", $user_id ) ); 
 
      if ( ! empty( $post_ids ) ) { 
          $wpdb->query( $wpdb->prepare( "UPDATE $wpdb->posts SET post_author = %d WHERE post_author = %d", $reassign, $user_id ) ); 
          array_walk( $post_ids, 'clean_post_cache' ); 
      } 
 
      if ( ! empty( $link_ids ) ) { 
          $wpdb->query( $wpdb->prepare( "UPDATE $wpdb->links SET link_owner = %d WHERE link_owner = %d", $reassign, $user_id ) ); 
          array_walk( $link_ids, 'clean_bookmark_cache' ); 
      } 
  } 
 
  restore_current_blog(); 
 
  return true; 
} 
 
/** 
 * Get the permalink for a post on another blog. 
 * 
 * @since MU 1.0 
 * 
 * @param int $blog_id ID of the source blog. 
 * @param int $post_id ID of the desired post. 
 * @return string The post's permalink 
 */ 
function get_blog_permalink( $blog_id, $post_id ) { 
  switch_to_blog( $blog_id ); 
  $link = get_permalink( $post_id ); 
  restore_current_blog(); 
 
  return $link; 
} 
 
/** 
 * Get a blog's numeric ID from its URL. 
 * 
 * On a subdirectory installation like example.com/blog1/,  
 * $domain will be the root 'example.com' and $path the 
 * subdirectory '/blog1/'. With subdomains like blog1.example.com,  
 * $domain is 'blog1.example.com' and $path is '/'. 
 * 
 * @since MU 2.6.5 
 * 
 * @global wpdb $wpdb WordPress database abstraction object. 
 * 
 * @param string $domain 
 * @param string $path   Optional. Not required for subdomain installations. 
 * @return int 0 if no blog found, otherwise the ID of the matching blog 
 */ 
function get_blog_id_from_url( $domain, $path = '/' ) { 
  $domain = strtolower( $domain ); 
  $path = strtolower( $path ); 
  $id = wp_cache_get( md5( $domain . $path ), 'blog-id-cache' ); 
 
  if ( $id == -1 ) // blog does not exist 
      return 0; 
  elseif ( $id ) 
      return (int) $id; 
 
  $args = array( 
      'domain' => $domain,  
      'path' => $path,  
      'fields' => 'ids',  
 ); 
  $result = get_sites( $args ); 
  $id = array_shift( $result ); 
 
  if ( ! $id ) { 
      wp_cache_set( md5( $domain . $path ), -1, 'blog-id-cache' ); 
      return 0; 
  } 
 
  wp_cache_set( md5( $domain . $path ), $id, 'blog-id-cache' ); 
 
  return $id; 
} 
 
// Admin functions 
 
/** 
 * Checks an email address against a list of banned domains. 
 * 
 * This function checks against the Banned Email Domains list 
 * at wp-admin/network/settings.php. The check is only run on 
 * self-registrations; user creation at wp-admin/network/users.php 
 * bypasses this check. 
 * 
 * @since MU 
 * 
 * @param string $user_email The email provided by the user at registration. 
 * @return bool Returns true when the email address is banned. 
 */ 
function is_email_address_unsafe( $user_email ) { 
  $banned_names = get_site_option( 'banned_email_domains' ); 
  if ( $banned_names && ! is_array( $banned_names ) ) 
      $banned_names = explode( "\n", $banned_names ); 
 
  $is_email_address_unsafe = false; 
 
  if ( $banned_names && is_array( $banned_names ) ) { 
      $banned_names = array_map( 'strtolower', $banned_names ); 
      $normalized_email = strtolower( $user_email ); 
 
      list( $email_local_part, $email_domain ) = explode( '@', $normalized_email ); 
 
      foreach ( $banned_names as $banned_domain ) { 
          if ( ! $banned_domain ) 
              continue; 
 
          if ( $email_domain == $banned_domain ) { 
              $is_email_address_unsafe = true; 
              break; 
          } 
 
          $dotted_domain = ".$banned_domain"; 
          if ( $dotted_domain === substr( $normalized_email, -strlen( $dotted_domain ) ) ) { 
              $is_email_address_unsafe = true; 
              break; 
          } 
      } 
  } 
 
  /** 
   * Filters whether an email address is unsafe. 
   * 
   * @since 3.5.0 
   * 
   * @param bool   $is_email_address_unsafe Whether the email address is "unsafe". Default false. 
   * @param string $user_email              User email address. 
   */ 
  return apply_filters( 'is_email_address_unsafe', $is_email_address_unsafe, $user_email ); 
} 
 
/** 
 * Sanitize and validate data required for a user sign-up. 
 * 
 * Verifies the validity and uniqueness of user names and user email addresses,  
 * and checks email addresses against admin-provided domain whitelists and blacklists. 
 * 
 * The {@see 'wpmu_validate_user_signup'} hook provides an easy way to modify the sign-up 
 * process. The value $result, which is passed to the hook, contains both the user-provided 
 * info and the error messages created by the function. {@see 'wpmu_validate_user_signup'} 
 * allows you to process the data in any way you'd like, and unset the relevant errors if 
 * necessary. 
 * 
 * @since MU 
 * 
 * @global wpdb $wpdb WordPress database abstraction object. 
 * 
 * @param string $user_name  The login name provided by the user. 
 * @param string $user_email The email provided by the user. 
 * @return array Contains username, email, and error messages. 
 */ 
function wpmu_validate_user_signup($user_name, $user_email) { 
  global $wpdb; 
 
  $errors = new WP_Error(); 
 
  $orig_username = $user_name; 
  $user_name = preg_replace( '/\s+/', '', sanitize_user( $user_name, true ) ); 
 
  if ( $user_name != $orig_username || preg_match( '/[^a-z0-9]/', $user_name ) ) { 
      $errors->add( 'user_name', __( 'Usernames can only contain lowercase letters (a-z) and numbers.' ) ); 
      $user_name = $orig_username; 
  } 
 
  $user_email = sanitize_email( $user_email ); 
 
  if ( empty( $user_name ) ) 
         $errors->add('user_name', __( 'Please enter a username.' ) ); 
 
  $illegal_names = get_site_option( 'illegal_names' ); 
  if ( ! is_array( $illegal_names ) ) { 
      $illegal_names = array(  'www', 'web', 'root', 'admin', 'main', 'invite', 'administrator' ); 
      add_site_option( 'illegal_names', $illegal_names ); 
  } 
  if ( in_array( $user_name, $illegal_names ) ) { 
      $errors->add( 'user_name', __( 'Sorry, that username is not allowed.' ) ); 
  } 
 
  /** This filter is documented in wp-includes/user.php */ 
  $illegal_logins = (array) apply_filters( 'illegal_user_logins', array() ); 
 
  if ( in_array( strtolower( $user_name ), array_map( 'strtolower', $illegal_logins ) ) ) { 
      $errors->add( 'user_name', __( 'Sorry, that username is not allowed.' ) ); 
  } 
 
  if ( is_email_address_unsafe( $user_email ) ) 
      $errors->add('user_email', __('You cannot use that email address to signup. We are having problems with them blocking some of our email. Please use another email provider.')); 
 
  if ( strlen( $user_name ) < 4 ) 
      $errors->add('user_name', __( 'Username must be at least 4 characters.' ) ); 
 
  if ( strlen( $user_name ) > 60 ) { 
      $errors->add( 'user_name', __( 'Username may not be longer than 60 characters.' ) ); 
  } 
 
  // all numeric? 
  if ( preg_match( '/^[0-9]*$/', $user_name ) ) 
      $errors->add('user_name', __('Sorry, usernames must have letters too!')); 
 
  if ( !is_email( $user_email ) ) 
      $errors->add('user_email', __( 'Please enter a valid email address.' ) ); 
 
  $limited_email_domains = get_site_option( 'limited_email_domains' ); 
  if ( is_array( $limited_email_domains ) && ! empty( $limited_email_domains ) ) { 
      $emaildomain = substr( $user_email, 1 + strpos( $user_email, '@' ) ); 
      if ( ! in_array( $emaildomain, $limited_email_domains ) ) { 
          $errors->add('user_email', __('Sorry, that email address is not allowed!')); 
      } 
  } 
 
  // Check if the username has been used already. 
  if ( username_exists($user_name) ) 
      $errors->add( 'user_name', __( 'Sorry, that username already exists!' ) ); 
 
  // Check if the email address has been used already. 
  if ( email_exists($user_email) ) 
      $errors->add( 'user_email', __( 'Sorry, that email address is already used!' ) ); 
 
  // Has someone already signed up for this username? 
  $signup = $wpdb->get_row( $wpdb->prepare("SELECT * FROM $wpdb->signups WHERE user_login = %s", $user_name) ); 
  if ( $signup != null ) { 
      $registered_at =  mysql2date('U', $signup->registered); 
      $now = current_time( 'timestamp', true ); 
      $diff = $now - $registered_at; 
      // If registered more than two days ago, cancel registration and let this signup go through. 
      if ( $diff > 2 * DAY_IN_SECONDS ) 
          $wpdb->delete( $wpdb->signups, array( 'user_login' => $user_name ) ); 
      else 
          $errors->add('user_name', __('That username is currently reserved but may be available in a couple of days.')); 
  } 
 
  $signup = $wpdb->get_row( $wpdb->prepare("SELECT * FROM $wpdb->signups WHERE user_email = %s", $user_email) ); 
  if ( $signup != null ) { 
      $diff = current_time( 'timestamp', true ) - mysql2date('U', $signup->registered); 
      // If registered more than two days ago, cancel registration and let this signup go through. 
      if ( $diff > 2 * DAY_IN_SECONDS ) 
          $wpdb->delete( $wpdb->signups, array( 'user_email' => $user_email ) ); 
      else 
          $errors->add('user_email', __('That email address has already been used. Please check your inbox for an activation email. It will become available in a couple of days if you do nothing.')); 
  } 
 
  $result = array('user_name' => $user_name, 'orig_username' => $orig_username, 'user_email' => $user_email, 'errors' => $errors); 
 
  /** 
   * Filters the validated user registration details. 
   * 
   * This does not allow you to override the username or email of the user during 
   * registration. The values are solely used for validation and error handling. 
   * 
   * @since MU 
   * 
   * @param array $result { 
   *     The array of user name, email and the error messages. 
   * 
   *     @type string   $user_name     Sanitized and unique username. 
   *     @type string   $orig_username Original username. 
   *     @type string   $user_email    User email address. 
   *     @type WP_Error $errors        WP_Error object containing any errors found. 
   * } 
   */ 
  return apply_filters( 'wpmu_validate_user_signup', $result ); 
} 
 
/** 
 * Processes new site registrations. 
 * 
 * Checks the data provided by the user during blog signup. Verifies 
 * the validity and uniqueness of blog paths and domains. 
 * 
 * This function prevents the current user from registering a new site 
 * with a blogname equivalent to another user's login name. Passing the 
 * $user parameter to the function, where $user is the other user, is 
 * effectively an override of this limitation. 
 * 
 * Filter {@see 'wpmu_validate_blog_signup'} if you want to modify 
 * the way that WordPress validates new site signups. 
 * 
 * @since MU 
 * 
 * @global wpdb   $wpdb 
 * @global string $domain 
 * 
 * @param string         $blogname   The blog name provided by the user. Must be unique. 
 * @param string         $blog_title The blog title provided by the user. 
 * @param WP_User|string $user       Optional. The user object to check against the new site name. 
 * @return array Contains the new site data and error messages. 
 */ 
function wpmu_validate_blog_signup( $blogname, $blog_title, $user = '' ) { 
  global $wpdb, $domain; 
 
  $current_network = get_network(); 
  $base = $current_network->path; 
 
  $blog_title = strip_tags( $blog_title ); 
 
  $errors = new WP_Error(); 
  $illegal_names = get_site_option( 'illegal_names' ); 
  if ( $illegal_names == false ) { 
      $illegal_names = array( 'www', 'web', 'root', 'admin', 'main', 'invite', 'administrator' ); 
      add_site_option( 'illegal_names', $illegal_names ); 
  } 
 
  /** 
   * On sub dir installs, some names are so illegal, only a filter can 
   * spring them from jail. 
   */ 
  if ( ! is_subdomain_install() ) { 
      $illegal_names = array_merge( $illegal_names, get_subdirectory_reserved_names() ); 
  } 
 
  if ( empty( $blogname ) ) 
      $errors->add('blogname', __( 'Please enter a site name.' ) ); 
 
  if ( preg_match( '/[^a-z0-9]+/', $blogname ) ) { 
      $errors->add( 'blogname', __( 'Site names can only contain lowercase letters (a-z) and numbers.' ) ); 
  } 
 
  if ( in_array( $blogname, $illegal_names ) ) 
      $errors->add('blogname', __( 'That name is not allowed.' ) ); 
 
  if ( strlen( $blogname ) < 4 && !is_super_admin() ) 
      $errors->add('blogname', __( 'Site name must be at least 4 characters.' ) ); 
 
  // do not allow users to create a blog that conflicts with a page on the main blog. 
  if ( !is_subdomain_install() && $wpdb->get_var( $wpdb->prepare( "SELECT post_name FROM " . $wpdb->get_blog_prefix( $current_network->site_id ) . "posts WHERE post_type = 'page' AND post_name = %s", $blogname ) ) ) 
      $errors->add( 'blogname', __( 'Sorry, you may not use that site name.' ) ); 
 
  // all numeric? 
  if ( preg_match( '/^[0-9]*$/', $blogname ) ) 
      $errors->add('blogname', __('Sorry, site names must have letters too!')); 
 
  /** 
   * Filters the new site name during registration. 
   * 
   * The name is the site's subdomain or the site's subdirectory 
   * path depending on the network settings. 
   * 
   * @since MU 
   * 
   * @param string $blogname Site name. 
   */ 
  $blogname = apply_filters( 'newblogname', $blogname ); 
 
  $blog_title = wp_unslash(  $blog_title ); 
 
  if ( empty( $blog_title ) ) 
      $errors->add('blog_title', __( 'Please enter a site title.' ) ); 
 
  // Check if the domain/path has been used already. 
  if ( is_subdomain_install() ) { 
      $mydomain = $blogname . '.' . preg_replace( '|^www\.|', '', $domain ); 
      $path = $base; 
  } else { 
      $mydomain = "$domain"; 
      $path = $base.$blogname.'/'; 
  } 
  if ( domain_exists($mydomain, $path, $current_network->id) ) 
      $errors->add( 'blogname', __( 'Sorry, that site already exists!' ) ); 
 
  if ( username_exists( $blogname ) ) { 
      if ( ! is_object( $user ) || ( is_object($user) && ( $user->user_login != $blogname ) ) ) 
          $errors->add( 'blogname', __( 'Sorry, that site is reserved!' ) ); 
  } 
 
  // Has someone already signed up for this domain? 
  $signup = $wpdb->get_row( $wpdb->prepare("SELECT * FROM $wpdb->signups WHERE domain = %s AND path = %s", $mydomain, $path) ); // TODO: Check email too? 
  if ( ! empty($signup) ) { 
      $diff = current_time( 'timestamp', true ) - mysql2date('U', $signup->registered); 
      // If registered more than two days ago, cancel registration and let this signup go through. 
      if ( $diff > 2 * DAY_IN_SECONDS ) 
          $wpdb->delete( $wpdb->signups, array( 'domain' => $mydomain , 'path' => $path ) ); 
      else 
          $errors->add('blogname', __('That site is currently reserved but may be available in a couple days.')); 
  } 
 
  $result = array('domain' => $mydomain, 'path' => $path, 'blogname' => $blogname, 'blog_title' => $blog_title, 'user' => $user, 'errors' => $errors); 
 
  /** 
   * Filters site details and error messages following registration. 
   * 
   * @since MU 
   * 
   * @param array $result { 
   *     Array of domain, path, blog name, blog title, user and error messages. 
   * 
   *     @type string         $domain     Domain for the site. 
   *     @type string         $path       Path for the site. Used in subdirectory installs. 
   *     @type string         $blogname   The unique site name (slug). 
   *     @type string         $blog_title Blog title. 
   *     @type string|WP_User $user       By default, an empty string. A user object if provided. 
   *     @type WP_Error       $errors     WP_Error containing any errors found. 
   * } 
   */ 
  return apply_filters( 'wpmu_validate_blog_signup', $result ); 
} 
 
/** 
 * Record site signup information for future activation. 
 * 
 * @since MU 
 * 
 * @global wpdb $wpdb WordPress database abstraction object. 
 * 
 * @param string $domain     The requested domain. 
 * @param string $path       The requested path. 
 * @param string $title      The requested site title. 
 * @param string $user       The user's requested login name. 
 * @param string $user_email The user's email address. 
 * @param array  $meta       By default, contains the requested privacy setting and lang_id. 
 */ 
function wpmu_signup_blog( $domain, $path, $title, $user, $user_email, $meta = array() )  { 
  global $wpdb; 
 
  $key = substr( md5( time() . wp_rand() . $domain ), 0, 16 ); 
  $meta = serialize($meta); 
 
  $wpdb->insert( $wpdb->signups, array( 
      'domain' => $domain,  
      'path' => $path,  
      'title' => $title,  
      'user_login' => $user,  
      'user_email' => $user_email,  
      'registered' => current_time('mysql', true),  
      'activation_key' => $key,  
      'meta' => $meta 
 ) ); 
 
  /** 
   * Fires after site signup information has been written to the database. 
   * 
   * @since 4.4.0 
   * 
   * @param string $domain     The requested domain. 
   * @param string $path       The requested path. 
   * @param string $title      The requested site title. 
   * @param string $user       The user's requested login name. 
   * @param string $user_email The user's email address. 
   * @param string $key        The user's activation key 
   * @param array  $meta       By default, contains the requested privacy setting and lang_id. 
   */ 
  do_action( 'after_signup_site', $domain, $path, $title, $user, $user_email, $key, $meta ); 
} 
 
/** 
 * Record user signup information for future activation. 
 * 
 * This function is used when user registration is open but 
 * new site registration is not. 
 * 
 * @since MU 
 * 
 * @global wpdb $wpdb WordPress database abstraction object. 
 * 
 * @param string $user       The user's requested login name. 
 * @param string $user_email The user's email address. 
 * @param array  $meta       By default, this is an empty array. 
 */ 
function wpmu_signup_user( $user, $user_email, $meta = array() ) { 
  global $wpdb; 
 
  // Format data 
  $user = preg_replace( '/\s+/', '', sanitize_user( $user, true ) ); 
  $user_email = sanitize_email( $user_email ); 
  $key = substr( md5( time() . wp_rand() . $user_email ), 0, 16 ); 
  $meta = serialize($meta); 
 
  $wpdb->insert( $wpdb->signups, array( 
      'domain' => '',  
      'path' => '',  
      'title' => '',  
      'user_login' => $user,  
      'user_email' => $user_email,  
      'registered' => current_time('mysql', true),  
      'activation_key' => $key,  
      'meta' => $meta 
 ) ); 
 
  /** 
   * Fires after a user's signup information has been written to the database. 
   * 
   * @since 4.4.0 
   * 
   * @param string $user       The user's requested login name. 
   * @param string $user_email The user's email address. 
   * @param string $key        The user's activation key 
   * @param array  $meta       Additional signup meta. By default, this is an empty array. 
   */ 
  do_action( 'after_signup_user', $user, $user_email, $key, $meta ); 
} 
 
/** 
 * Notify user of signup success. 
 * 
 * This is the notification function used when site registration 
 * is enabled. 
 * 
 * Filter {@see 'wpmu_signup_blog_notification'} to bypass this function or 
 * replace it with your own notification behavior. 
 * 
 * Filter {@see 'wpmu_signup_blog_notification_email'} and 
 * {@see 'wpmu_signup_blog_notification_subject'} to change the content 
 * and subject line of the email sent to newly registered users. 
 * 
 * @since MU 
 * 
 * @param string $domain     The new blog domain. 
 * @param string $path       The new blog path. 
 * @param string $title      The site title. 
 * @param string $user_login The user's login name. 
 * @param string $user_email The user's email address. 
 * @param string $key        The activation key created in wpmu_signup_blog() 
 * @param array  $meta       By default, contains the requested privacy setting and lang_id. 
 * @return bool 
 */ 
function wpmu_signup_blog_notification( $domain, $path, $title, $user_login, $user_email, $key, $meta = array() ) { 
  /** 
   * Filters whether to bypass the new site email notification. 
   * 
   * @since MU 
   * 
   * @param string|bool $domain     Site domain. 
   * @param string      $path       Site path. 
   * @param string      $title      Site title. 
   * @param string      $user_login User login name. 
   * @param string      $user_email User email address. 
   * @param string      $key        Activation key created in wpmu_signup_blog(). 
   * @param array       $meta       By default, contains the requested privacy setting and lang_id. 
   */ 
  if ( ! apply_filters( 'wpmu_signup_blog_notification', $domain, $path, $title, $user_login, $user_email, $key, $meta ) ) { 
      return false; 
  } 
 
  // Send email with activation link. 
  if ( !is_subdomain_install() || get_current_network_id() != 1 ) 
      $activate_url = network_site_url("wp-activate.php?key=$key"); 
  else 
      $activate_url = "http://{$domain}{$path}wp-activate.php?key=$key"; // @todo use *_url() API 
 
  $activate_url = esc_url($activate_url); 
  $admin_email = get_site_option( 'admin_email' ); 
  if ( $admin_email == '' ) 
      $admin_email = 'support@' . $_SERVER['SERVER_NAME']; 
  $from_name = get_site_option( 'site_name' ) == '' ? 'WordPress' : esc_html( get_site_option( 'site_name' ) ); 
  $message_headers = "From: \"{$from_name}\" <{$admin_email}>\n" . "Content-Type: text/plain; charset=\"" . get_option('blog_charset') . "\"\n"; 
 
  $user = get_user_by( 'login', $user_login ); 
  $switched_locale = switch_to_locale( get_user_locale( $user ) ); 
 
  $message = sprintf( 
      /** 
       * Filters the message content of the new blog notification email. 
       * 
       * Content should be formatted for transmission via wp_mail(). 
       * 
       * @since MU 
       * 
       * @param string $content    Content of the notification email. 
       * @param string $domain     Site domain. 
       * @param string $path       Site path. 
       * @param string $title      Site title. 
       * @param string $user_login User login name. 
       * @param string $user_email User email address. 
       * @param string $key        Activation key created in wpmu_signup_blog(). 
       * @param array  $meta       By default, contains the requested privacy setting and lang_id. 
       */ 
      apply_filters( 'wpmu_signup_blog_notification_email',  
          __( "To activate your blog, please click the following link:\n\n%s\n\nAfter you activate, you will receive *another email* with your login.\n\nAfter you activate, you can visit your site here:\n\n%s" ),  
          $domain, $path, $title, $user_login, $user_email, $key, $meta 
 ),  
      $activate_url,  
      esc_url( "http://{$domain}{$path}" ),  
      $key 
 ); 
  // TODO: Don't hard code activation link. 
  $subject = sprintf( 
      /** 
       * Filters the subject of the new blog notification email. 
       * 
       * @since MU 
       * 
       * @param string $subject    Subject of the notification email. 
       * @param string $domain     Site domain. 
       * @param string $path       Site path. 
       * @param string $title      Site title. 
       * @param string $user_login User login name. 
       * @param string $user_email User email address. 
       * @param string $key        Activation key created in wpmu_signup_blog(). 
       * @param array  $meta       By default, contains the requested privacy setting and lang_id. 
       */ 
      apply_filters( 'wpmu_signup_blog_notification_subject',  
          /** translators: New site notification email subject. 1: Network name, 2: New site URL */ 
          _x( '[%1$s] Activate %2$s', 'New site notification email subject' ),  
          $domain, $path, $title, $user_login, $user_email, $key, $meta 
 ),  
      $from_name,  
      esc_url( 'http://' . $domain . $path ) 
 ); 
  wp_mail( $user_email, wp_specialchars_decode( $subject ), $message, $message_headers ); 
 
  if ( $switched_locale ) { 
      restore_previous_locale(); 
  } 
 
  return true; 
} 
 
/** 
 * Notify user of signup success. 
 * 
 * This is the notification function used when no new site has 
 * been requested. 
 * 
 * Filter {@see 'wpmu_signup_user_notification'} to bypass this function or 
 * replace it with your own notification behavior. 
 * 
 * Filter {@see 'wpmu_signup_user_notification_email'} and 
 * {@see 'wpmu_signup_user_notification_subject'} to change the content 
 * and subject line of the email sent to newly registered users. 
 * 
 * @since MU 
 * 
 * @param string $user_login The user's login name. 
 * @param string $user_email The user's email address. 
 * @param string $key        The activation key created in wpmu_signup_user() 
 * @param array  $meta       By default, an empty array. 
 * @return bool 
 */ 
function wpmu_signup_user_notification( $user_login, $user_email, $key, $meta = array() ) { 
  /** 
   * Filters whether to bypass the email notification for new user sign-up. 
   * 
   * @since MU 
   * 
   * @param string $user_login User login name. 
   * @param string $user_email User email address. 
   * @param string $key        Activation key created in wpmu_signup_user(). 
   * @param array  $meta       Signup meta data. 
   */ 
  if ( ! apply_filters( 'wpmu_signup_user_notification', $user_login, $user_email, $key, $meta ) ) 
      return false; 
 
  $user = get_user_by( 'login', $user_login ); 
  $switched_locale = switch_to_locale( get_user_locale( $user ) ); 
 
  // Send email with activation link. 
  $admin_email = get_site_option( 'admin_email' ); 
  if ( $admin_email == '' ) 
      $admin_email = 'support@' . $_SERVER['SERVER_NAME']; 
  $from_name = get_site_option( 'site_name' ) == '' ? 'WordPress' : esc_html( get_site_option( 'site_name' ) ); 
  $message_headers = "From: \"{$from_name}\" <{$admin_email}>\n" . "Content-Type: text/plain; charset=\"" . get_option('blog_charset') . "\"\n"; 
  $message = sprintf( 
      /** 
       * Filters the content of the notification email for new user sign-up. 
       * 
       * Content should be formatted for transmission via wp_mail(). 
       * 
       * @since MU 
       * 
       * @param string $content    Content of the notification email. 
       * @param string $user_login User login name. 
       * @param string $user_email User email address. 
       * @param string $key        Activation key created in wpmu_signup_user(). 
       * @param array  $meta       Signup meta data. 
       */ 
      apply_filters( 'wpmu_signup_user_notification_email',  
          __( "To activate your user, please click the following link:\n\n%s\n\nAfter you activate, you will receive *another email* with your login." ),  
          $user_login, $user_email, $key, $meta 
 ),  
      site_url( "wp-activate.php?key=$key" ) 
 ); 
  // TODO: Don't hard code activation link. 
  $subject = sprintf( 
      /** 
       * Filters the subject of the notification email of new user signup. 
       * 
       * @since MU 
       * 
       * @param string $subject    Subject of the notification email. 
       * @param string $user_login User login name. 
       * @param string $user_email User email address. 
       * @param string $key        Activation key created in wpmu_signup_user(). 
       * @param array  $meta       Signup meta data. 
       */ 
      apply_filters( 'wpmu_signup_user_notification_subject',  
          /** translators: New user notification email subject. 1: Network name, 2: New user login */ 
          _x( '[%1$s] Activate %2$s', 'New user notification email subject' ),  
          $user_login, $user_email, $key, $meta 
 ),  
      $from_name,  
      $user_login 
 ); 
  wp_mail( $user_email, wp_specialchars_decode( $subject ), $message, $message_headers ); 
 
  if ( $switched_locale ) { 
      restore_previous_locale(); 
  } 
 
  return true; 
} 
 
/** 
 * Activate a signup. 
 * 
 * Hook to {@see 'wpmu_activate_user'} or {@see 'wpmu_activate_blog'} for events 
 * that should happen only when users or sites are self-created (since 
 * those actions are not called when users and sites are created 
 * by a Super Admin). 
 * 
 * @since MU 
 * 
 * @global wpdb $wpdb WordPress database abstraction object. 
 * 
 * @param string $key The activation key provided to the user. 
 * @return array|WP_Error An array containing information about the activated user and/or blog 
 */ 
function wpmu_activate_signup($key) { 
  global $wpdb; 
 
  $signup = $wpdb->get_row( $wpdb->prepare("SELECT * FROM $wpdb->signups WHERE activation_key = %s", $key) ); 
 
  if ( empty( $signup ) ) 
      return new WP_Error( 'invalid_key', __( 'Invalid activation key.' ) ); 
 
  if ( $signup->active ) { 
      if ( empty( $signup->domain ) ) 
          return new WP_Error( 'already_active', __( 'The user is already active.' ), $signup ); 
      else 
          return new WP_Error( 'already_active', __( 'The site is already active.' ), $signup ); 
  } 
 
  $meta = maybe_unserialize($signup->meta); 
  $password = wp_generate_password( 12, false ); 
 
  $user_id = username_exists($signup->user_login); 
 
  if ( ! $user_id ) 
      $user_id = wpmu_create_user($signup->user_login, $password, $signup->user_email); 
  else 
      $user_already_exists = true; 
 
  if ( ! $user_id ) 
      return new WP_Error('create_user', __('Could not create user'), $signup); 
 
  $now = current_time('mysql', true); 
 
  if ( empty($signup->domain) ) { 
      $wpdb->update( $wpdb->signups, array('active' => 1, 'activated' => $now), array('activation_key' => $key) ); 
 
      if ( isset( $user_already_exists ) ) 
          return new WP_Error( 'user_already_exists', __( 'That username is already activated.' ), $signup); 
 
      /** 
       * Fires immediately after a new user is activated. 
       * 
       * @since MU 
       * 
       * @param int   $user_id  User ID. 
       * @param int   $password User password. 
       * @param array $meta     Signup meta data. 
       */ 
      do_action( 'wpmu_activate_user', $user_id, $password, $meta ); 
      return array( 'user_id' => $user_id, 'password' => $password, 'meta' => $meta ); 
  } 
 
  $blog_id = wpmu_create_blog( $signup->domain, $signup->path, $signup->title, $user_id, $meta, $wpdb->siteid ); 
 
  // TODO: What to do if we create a user but cannot create a blog? 
  if ( is_wp_error($blog_id) ) { 
      // If blog is taken, that means a previous attempt to activate this blog failed in between creating the blog and 
      // setting the activation flag. Let's just set the active flag and instruct the user to reset their password. 
      if ( 'blog_taken' == $blog_id->get_error_code() ) { 
          $blog_id->add_data( $signup ); 
          $wpdb->update( $wpdb->signups, array( 'active' => 1, 'activated' => $now ), array( 'activation_key' => $key ) ); 
      } 
      return $blog_id; 
  } 
 
  $wpdb->update( $wpdb->signups, array('active' => 1, 'activated' => $now), array('activation_key' => $key) ); 
  /** 
   * Fires immediately after a site is activated. 
   * 
   * @since MU 
   * 
   * @param int    $blog_id       Blog ID. 
   * @param int    $user_id       User ID. 
   * @param int    $password      User password. 
   * @param string $signup_title  Site title. 
   * @param array  $meta          Signup meta data. 
   */ 
  do_action( 'wpmu_activate_blog', $blog_id, $user_id, $password, $signup->title, $meta ); 
 
  return array('blog_id' => $blog_id, 'user_id' => $user_id, 'password' => $password, 'title' => $signup->title, 'meta' => $meta); 
} 
 
/** 
 * Create a user. 
 * 
 * This function runs when a user self-registers as well as when 
 * a Super Admin creates a new user. Hook to {@see 'wpmu_new_user'} for events 
 * that should affect all new users, but only on Multisite (otherwise 
 * use {@see'user_register'}). 
 * 
 * @since MU 
 * 
 * @param string $user_name The new user's login name. 
 * @param string $password  The new user's password. 
 * @param string $email     The new user's email address. 
 * @return int|false Returns false on failure, or int $user_id on success 
 */ 
function wpmu_create_user( $user_name, $password, $email ) { 
  $user_name = preg_replace( '/\s+/', '', sanitize_user( $user_name, true ) ); 
 
  $user_id = wp_create_user( $user_name, $password, $email ); 
  if ( is_wp_error( $user_id ) ) 
      return false; 
 
  // Newly created users have no roles or caps until they are added to a blog. 
  delete_user_option( $user_id, 'capabilities' ); 
  delete_user_option( $user_id, 'user_level' ); 
 
  /** 
   * Fires immediately after a new user is created. 
   * 
   * @since MU 
   * 
   * @param int $user_id User ID. 
   */ 
  do_action( 'wpmu_new_user', $user_id ); 
 
  return $user_id; 
} 
 
/** 
 * Create a site. 
 * 
 * This function runs when a user self-registers a new site as well 
 * as when a Super Admin creates a new site. Hook to {@see 'wpmu_new_blog'} 
 * for events that should affect all new sites. 
 * 
 * On subdirectory installs, $domain is the same as the main site's 
 * domain, and the path is the subdirectory name (eg 'example.com' 
 * and '/blog1/'). On subdomain installs, $domain is the new subdomain + 
 * root domain (eg 'blog1.example.com'), and $path is '/'. 
 * 
 * @since MU 
 * 
 * @param string $domain  The new site's domain. 
 * @param string $path    The new site's path. 
 * @param string $title   The new site's title. 
 * @param int    $user_id The user ID of the new site's admin. 
 * @param array  $meta    Optional. Used to set initial site options. 
 * @param int    $site_id Optional. Only relevant on multi-network installs. 
 * @return int|WP_Error Returns WP_Error object on failure, int $blog_id on success 
 */ 
function wpmu_create_blog( $domain, $path, $title, $user_id, $meta = array(), $site_id = 1 ) { 
  $defaults = array( 
      'public' => 0,  
      'WPLANG' => get_site_option( 'WPLANG' ),  
 ); 
  $meta = wp_parse_args( $meta, $defaults ); 
 
  $domain = preg_replace( '/\s+/', '', sanitize_user( $domain, true ) ); 
 
  if ( is_subdomain_install() ) 
      $domain = str_replace( '@', '', $domain ); 
 
  $title = strip_tags( $title ); 
  $user_id = (int) $user_id; 
 
  if ( empty($path) ) 
      $path = '/'; 
 
  // Check if the domain has been used already. We should return an error message. 
  if ( domain_exists($domain, $path, $site_id) ) 
      return new WP_Error( 'blog_taken', __( 'Sorry, that site already exists!' ) ); 
 
  if ( ! wp_installing() ) { 
      wp_installing( true ); 
  } 
 
  if ( ! $blog_id = insert_blog($domain, $path, $site_id) ) 
      return new WP_Error('insert_blog', __('Could not create site.')); 
 
  switch_to_blog($blog_id); 
  install_blog($blog_id, $title); 
  wp_install_defaults($user_id); 
 
  add_user_to_blog($blog_id, $user_id, 'administrator'); 
 
  foreach ( $meta as $key => $value ) { 
      if ( in_array( $key, array( 'public', 'archived', 'mature', 'spam', 'deleted', 'lang_id' ) ) ) 
          update_blog_status( $blog_id, $key, $value ); 
      else 
          update_option( $key, $value ); 
  } 
 
  update_option( 'blog_public', (int) $meta['public'] ); 
 
  if ( ! is_super_admin( $user_id ) && ! get_user_meta( $user_id, 'primary_blog', true ) ) 
      update_user_meta( $user_id, 'primary_blog', $blog_id ); 
 
  restore_current_blog(); 
  /** 
   * Fires immediately after a new site is created. 
   * 
   * @since MU 
   * 
   * @param int    $blog_id Blog ID. 
   * @param int    $user_id User ID. 
   * @param string $domain  Site domain. 
   * @param string $path    Site path. 
   * @param int    $site_id Site ID. Only relevant on multi-network installs. 
   * @param array  $meta    Meta data. Used to set initial site options. 
   */ 
  do_action( 'wpmu_new_blog', $blog_id, $user_id, $domain, $path, $site_id, $meta ); 
 
  wp_cache_set( 'last_changed', microtime(), 'sites' ); 
 
  return $blog_id; 
} 
 
/** 
 * Notifies the network admin that a new site has been activated. 
 * 
 * Filter {@see 'newblog_notify_siteadmin'} to change the content of 
 * the notification email. 
 * 
 * @since MU 
 * 
 * @param int    $blog_id    The new site's ID. 
 * @param string $deprecated Not used. 
 * @return bool 
 */ 
function newblog_notify_siteadmin( $blog_id, $deprecated = '' ) { 
  if ( get_site_option( 'registrationnotification' ) != 'yes' ) 
      return false; 
 
  $email = get_site_option( 'admin_email' ); 
  if ( is_email($email) == false ) 
      return false; 
 
  $options_site_url = esc_url(network_admin_url('settings.php')); 
 
  switch_to_blog( $blog_id ); 
  $blogname = get_option( 'blogname' ); 
  $siteurl = site_url(); 
  restore_current_blog(); 
 
  /** translators: New site notification email. 1: Site URL, 2: User IP address, 3: Settings screen URL */ 
  $msg = sprintf( __( 'New Site: %1$s 
URL: %2$s 
Remote IP: %3$s 
 
Disable these notifications: %4$s' ), $blogname, $siteurl, wp_unslash( $_SERVER['REMOTE_ADDR'] ), $options_site_url); 
  /** 
   * Filters the message body of the new site activation email sent 
   * to the network administrator. 
   * 
   * @since MU 
   * 
   * @param string $msg Email body. 
   */ 
  $msg = apply_filters( 'newblog_notify_siteadmin', $msg ); 
 
  wp_mail( $email, sprintf( __( 'New Site Registration: %s' ), $siteurl ), $msg ); 
  return true; 
} 
 
/** 
 * Notifies the network admin that a new user has been activated. 
 * 
 * Filter {@see 'newuser_notify_siteadmin'} to change the content of 
 * the notification email. 
 * 
 * @since MU 
 * 
 * @param int $user_id The new user's ID. 
 * @return bool 
 */ 
function newuser_notify_siteadmin( $user_id ) { 
  if ( get_site_option( 'registrationnotification' ) != 'yes' ) 
      return false; 
 
  $email = get_site_option( 'admin_email' ); 
 
  if ( is_email($email) == false ) 
      return false; 
 
  $user = get_userdata( $user_id ); 
 
  $options_site_url = esc_url(network_admin_url('settings.php')); 
  /** translators: New user notification email. 1: User login, 2: User IP address, 3: Settings screen URL */ 
  $msg = sprintf(__('New User: %1$s 
Remote IP: %2$s 
 
Disable these notifications: %3$s'), $user->user_login, wp_unslash( $_SERVER['REMOTE_ADDR'] ), $options_site_url); 
 
  /** 
   * Filters the message body of the new user activation email sent 
   * to the network administrator. 
   * 
   * @since MU 
   * 
   * @param string  $msg  Email body. 
   * @param WP_User $user WP_User instance of the new user. 
   */ 
  $msg = apply_filters( 'newuser_notify_siteadmin', $msg, $user ); 
  wp_mail( $email, sprintf(__('New User Registration: %s'), $user->user_login), $msg ); 
  return true; 
} 
 
/** 
 * Check whether a blogname is already taken. 
 * 
 * Used during the new site registration process to ensure 
 * that each blogname is unique. 
 * 
 * @since MU 
 * 
 * @global wpdb $wpdb WordPress database abstraction object. 
 * 
 * @param string $domain  The domain to be checked. 
 * @param string $path    The path to be checked. 
 * @param int    $site_id Optional. Relevant only on multi-network installs. 
 * @return int 
 */ 
function domain_exists($domain, $path, $site_id = 1) { 
  $path = trailingslashit( $path ); 
  $args = array( 
      'network_id' => $site_id,  
      'domain' => $domain,  
      'path' => $path,  
      'fields' => 'ids',  
 ); 
  $result = get_sites( $args ); 
  $result = array_shift( $result ); 
 
  /** 
   * Filters whether a blogname is taken. 
   * 
   * @since 3.5.0 
   * 
   * @param int|null $result  The blog_id if the blogname exists, null otherwise. 
   * @param string   $domain  Domain to be checked. 
   * @param string   $path    Path to be checked. 
   * @param int      $site_id Site ID. Relevant only on multi-network installs. 
   */ 
  return apply_filters( 'domain_exists', $result, $domain, $path, $site_id ); 
} 
 
/** 
 * Store basic site info in the blogs table. 
 * 
 * This function creates a row in the wp_blogs table and returns 
 * the new blog's ID. It is the first step in creating a new blog. 
 * 
 * @since MU 
 * 
 * @global wpdb $wpdb WordPress database abstraction object. 
 * 
 * @param string $domain  The domain of the new site. 
 * @param string $path    The path of the new site. 
 * @param int    $site_id Unless you're running a multi-network install, be sure to set this value to 1. 
 * @return int|false The ID of the new row 
 */ 
function insert_blog($domain, $path, $site_id) { 
  global $wpdb; 
 
  $path = trailingslashit($path); 
  $site_id = (int) $site_id; 
 
  $result = $wpdb->insert( $wpdb->blogs, array('site_id' => $site_id, 'domain' => $domain, 'path' => $path, 'registered' => current_time('mysql')) ); 
  if ( ! $result ) 
      return false; 
 
  $blog_id = $wpdb->insert_id; 
  refresh_blog_details( $blog_id ); 
 
  wp_maybe_update_network_site_counts(); 
 
  return $blog_id; 
} 
 
/** 
 * Install an empty blog. 
 * 
 * Creates the new blog tables and options. If calling this function 
 * directly, be sure to use switch_to_blog() first, so that $wpdb 
 * points to the new blog. 
 * 
 * @since MU 
 * 
 * @global wpdb     $wpdb 
 * @global WP_Roles $wp_roles 
 * 
 * @param int    $blog_id    The value returned by insert_blog(). 
 * @param string $blog_title The title of the new site. 
 */ 
function install_blog( $blog_id, $blog_title = '' ) { 
  global $wpdb, $wp_roles; 
 
  // Cast for security 
  $blog_id = (int) $blog_id; 
 
  require_once( ABSPATH . 'wp-admin/includes/upgrade.php' ); 
 
  $suppress = $wpdb->suppress_errors(); 
  if ( $wpdb->get_results( "DESCRIBE {$wpdb->posts}" ) ) 
      die( '<h1>' . __( 'Already Installed' ) . '</h1><p>' . __( 'You appear to have already installed WordPress. To reinstall please clear your old database tables first.' ) . '</p></body></html>' ); 
  $wpdb->suppress_errors( $suppress ); 
 
  $url = get_blogaddress_by_id( $blog_id ); 
 
  // Set everything up 
  make_db_current_silent( 'blog' ); 
  populate_options(); 
  populate_roles(); 
 
  // populate_roles() clears previous role definitions so we start over. 
  $wp_roles = new WP_Roles(); 
 
  $siteurl = $home = untrailingslashit( $url ); 
 
  if ( ! is_subdomain_install() ) { 
 
       if ( 'https' === parse_url( get_site_option( 'siteurl' ), PHP_URL_SCHEME ) ) { 
           $siteurl = set_url_scheme( $siteurl, 'https' ); 
       } 
       if ( 'https' === parse_url( get_home_url( get_network()->site_id ), PHP_URL_SCHEME ) ) { 
           $home = set_url_scheme( $home, 'https' ); 
       } 
 
  } 
 
  update_option( 'siteurl', $siteurl ); 
  update_option( 'home', $home ); 
 
  if ( get_site_option( 'ms_files_rewriting' ) ) 
      update_option( 'upload_path', UPLOADBLOGSDIR . "/$blog_id/files" ); 
  else 
      update_option( 'upload_path', get_blog_option( get_network()->site_id, 'upload_path' ) ); 
 
  update_option( 'blogname', wp_unslash( $blog_title ) ); 
  update_option( 'admin_email', '' ); 
 
  // remove all perms 
  $table_prefix = $wpdb->get_blog_prefix(); 
  delete_metadata( 'user', 0, $table_prefix . 'user_level', null, true ); // delete all 
  delete_metadata( 'user', 0, $table_prefix . 'capabilities', null, true ); // delete all 
} 
 
/** 
 * Set blog defaults. 
 * 
 * This function creates a row in the wp_blogs table. 
 * 
 * @since MU 
 * @deprecated MU 
 * @deprecated Use wp_install_defaults() 
 * 
 * @global wpdb $wpdb WordPress database abstraction object. 
 * 
 * @param int $blog_id Ignored in this function. 
 * @param int $user_id 
 */ 
function install_blog_defaults($blog_id, $user_id) { 
  global $wpdb; 
 
  require_once( ABSPATH . 'wp-admin/includes/upgrade.php' ); 
 
  $suppress = $wpdb->suppress_errors(); 
 
  wp_install_defaults($user_id); 
 
  $wpdb->suppress_errors( $suppress ); 
} 
 
/** 
 * Notify a user that their blog activation has been successful. 
 * 
 * Filter {@see 'wpmu_welcome_notification'} to disable or bypass. 
 * 
 * Filter {@see 'update_welcome_email'} and {@see 'update_welcome_subject'} to 
 * modify the content and subject line of the notification email. 
 * 
 * @since MU 
 * 
 * @param int    $blog_id 
 * @param int    $user_id 
 * @param string $password 
 * @param string $title    The new blog's title 
 * @param array  $meta     Optional. Not used in the default function, but is passed along to hooks for customization. 
 * @return bool 
 */ 
function wpmu_welcome_notification( $blog_id, $user_id, $password, $title, $meta = array() ) { 
  $current_network = get_network(); 
 
  /** 
   * Filters whether to bypass the welcome email after site activation. 
   * 
   * Returning false disables the welcome email. 
   * 
   * @since MU 
   * 
   * @param int|bool $blog_id  Blog ID. 
   * @param int      $user_id  User ID. 
   * @param string   $password User password. 
   * @param string   $title    Site title. 
   * @param array    $meta     Signup meta data. 
   */ 
  if ( ! apply_filters( 'wpmu_welcome_notification', $blog_id, $user_id, $password, $title, $meta ) ) 
      return false; 
 
  $user = get_userdata( $user_id ); 
 
  $switched_locale = switch_to_locale( get_user_locale( $user ) ); 
 
  $welcome_email = get_site_option( 'welcome_email' ); 
  if ( $welcome_email == false ) { 
      /** translators: Do not translate USERNAME, SITE_NAME, BLOG_URL, PASSWORD: those are placeholders. */ 
      $welcome_email = __( 'Howdy USERNAME,  
 
Your new SITE_NAME site has been successfully set up at: 
BLOG_URL 
 
You can log in to the administrator account with the following information: 
 
Username: USERNAME 
Password: PASSWORD 
Log in here: BLOG_URLwp-login.php 
 
We hope you enjoy your new site. Thanks! 
 
--The Team @ SITE_NAME' ); 
  } 
 
  $url = get_blogaddress_by_id($blog_id); 
 
  $welcome_email = str_replace( 'SITE_NAME', $current_network->site_name, $welcome_email ); 
  $welcome_email = str_replace( 'BLOG_TITLE', $title, $welcome_email ); 
  $welcome_email = str_replace( 'BLOG_URL', $url, $welcome_email ); 
  $welcome_email = str_replace( 'USERNAME', $user->user_login, $welcome_email ); 
  $welcome_email = str_replace( 'PASSWORD', $password, $welcome_email ); 
 
  /** 
   * Filters the content of the welcome email after site activation. 
   * 
   * Content should be formatted for transmission via wp_mail(). 
   * 
   * @since MU 
   * 
   * @param string $welcome_email Message body of the email. 
   * @param int    $blog_id       Blog ID. 
   * @param int    $user_id       User ID. 
   * @param string $password      User password. 
   * @param string $title         Site title. 
   * @param array  $meta          Signup meta data. 
   */ 
  $welcome_email = apply_filters( 'update_welcome_email', $welcome_email, $blog_id, $user_id, $password, $title, $meta ); 
  $admin_email = get_site_option( 'admin_email' ); 
 
  if ( $admin_email == '' ) 
      $admin_email = 'support@' . $_SERVER['SERVER_NAME']; 
 
  $from_name = get_site_option( 'site_name' ) == '' ? 'WordPress' : esc_html( get_site_option( 'site_name' ) ); 
  $message_headers = "From: \"{$from_name}\" <{$admin_email}>\n" . "Content-Type: text/plain; charset=\"" . get_option('blog_charset') . "\"\n"; 
  $message = $welcome_email; 
 
  if ( empty( $current_network->site_name ) ) 
      $current_network->site_name = 'WordPress'; 
 
  /** translators: New site notification email subject. 1: Network name, 2: New site name */ 
  $subject = __( 'New %1$s Site: %2$s' ); 
 
  /** 
   * Filters the subject of the welcome email after site activation. 
   * 
   * @since MU 
   * 
   * @param string $subject Subject of the email. 
   */ 
  $subject = apply_filters( 'update_welcome_subject', sprintf( $subject, $current_network->site_name, wp_unslash( $title ) ) ); 
  wp_mail( $user->user_email, wp_specialchars_decode( $subject ), $message, $message_headers ); 
 
  if ( $switched_locale ) { 
      restore_previous_locale(); 
  } 
 
  return true; 
} 
 
/** 
 * Notify a user that their account activation has been successful. 
 * 
 * Filter {@see 'wpmu_welcome_user_notification'} to disable or bypass. 
 * 
 * Filter {@see 'update_welcome_user_email'} and {@see 'update_welcome_user_subject'} to 
 * modify the content and subject line of the notification email. 
 * 
 * @since MU 
 * 
 * @param int    $user_id 
 * @param string $password 
 * @param array  $meta     Optional. Not used in the default function, but is passed along to hooks for customization. 
 * @return bool 
 */ 
function wpmu_welcome_user_notification( $user_id, $password, $meta = array() ) { 
  $current_network = get_network(); 
 
  /** 
    * Filters whether to bypass the welcome email after user activation. 
   * 
   * Returning false disables the welcome email. 
   * 
   * @since MU 
   * 
   * @param int    $user_id  User ID. 
   * @param string $password User password. 
   * @param array  $meta     Signup meta data. 
   */ 
  if ( ! apply_filters( 'wpmu_welcome_user_notification', $user_id, $password, $meta ) ) 
      return false; 
 
  $welcome_email = get_site_option( 'welcome_user_email' ); 
 
  $user = get_userdata( $user_id ); 
 
  $switched_locale = switch_to_locale( get_user_locale( $user ) ); 
 
  /** 
   * Filters the content of the welcome email after user activation. 
   * 
   * Content should be formatted for transmission via wp_mail(). 
   * 
   * @since MU 
   * 
   * @param string $welcome_email The message body of the account activation success email. 
   * @param int    $user_id       User ID. 
   * @param string $password      User password. 
   * @param array  $meta          Signup meta data. 
   */ 
  $welcome_email = apply_filters( 'update_welcome_user_email', $welcome_email, $user_id, $password, $meta ); 
  $welcome_email = str_replace( 'SITE_NAME', $current_network->site_name, $welcome_email ); 
  $welcome_email = str_replace( 'USERNAME', $user->user_login, $welcome_email ); 
  $welcome_email = str_replace( 'PASSWORD', $password, $welcome_email ); 
  $welcome_email = str_replace( 'LOGINLINK', wp_login_url(), $welcome_email ); 
 
  $admin_email = get_site_option( 'admin_email' ); 
 
  if ( $admin_email == '' ) 
      $admin_email = 'support@' . $_SERVER['SERVER_NAME']; 
 
  $from_name = get_site_option( 'site_name' ) == '' ? 'WordPress' : esc_html( get_site_option( 'site_name' ) ); 
  $message_headers = "From: \"{$from_name}\" <{$admin_email}>\n" . "Content-Type: text/plain; charset=\"" . get_option('blog_charset') . "\"\n"; 
  $message = $welcome_email; 
 
  if ( empty( $current_network->site_name ) ) 
      $current_network->site_name = 'WordPress'; 
 
  /** translators: New user notification email subject. 1: Network name, 2: New user login */ 
  $subject = __( 'New %1$s User: %2$s' ); 
 
  /** 
   * Filters the subject of the welcome email after user activation. 
   * 
   * @since MU 
   * 
   * @param string $subject Subject of the email. 
   */ 
  $subject = apply_filters( 'update_welcome_user_subject', sprintf( $subject, $current_network->site_name, $user->user_login) ); 
  wp_mail( $user->user_email, wp_specialchars_decode( $subject ), $message, $message_headers ); 
 
  if ( $switched_locale ) { 
      restore_previous_locale(); 
  } 
 
  return true; 
} 
 
/** 
 * Get the current network. 
 * 
 * Returns an object containing the 'id', 'domain', 'path', and 'site_name' 
 * properties of the network being viewed. 
 * 
 * @see wpmu_current_site() 
 * 
 * @since MU 
 * 
 * @global WP_Network $current_site 
 * 
 * @return WP_Network 
 */ 
function get_current_site() { 
  global $current_site; 
  return $current_site; 
} 
 
/** 
 * Get a user's most recent post. 
 * 
 * Walks through each of a user's blogs to find the post with 
 * the most recent post_date_gmt. 
 * 
 * @since MU 
 * 
 * @global wpdb $wpdb WordPress database abstraction object. 
 * 
 * @param int $user_id 
 * @return array Contains the blog_id, post_id, post_date_gmt, and post_gmt_ts 
 */ 
function get_most_recent_post_of_user( $user_id ) { 
  global $wpdb; 
 
  $user_blogs = get_blogs_of_user( (int) $user_id ); 
  $most_recent_post = array(); 
 
  // Walk through each blog and get the most recent post 
  // published by $user_id 
  foreach ( (array) $user_blogs as $blog ) { 
      $prefix = $wpdb->get_blog_prefix( $blog->userblog_id ); 
      $recent_post = $wpdb->get_row( $wpdb->prepare("SELECT ID, post_date_gmt FROM {$prefix}posts WHERE post_author = %d AND post_type = 'post' AND post_status = 'publish' ORDER BY post_date_gmt DESC LIMIT 1", $user_id ), ARRAY_A); 
 
      // Make sure we found a post 
      if ( isset($recent_post['ID']) ) { 
          $post_gmt_ts = strtotime($recent_post['post_date_gmt']); 
 
          // If this is the first post checked or if this post is 
          // newer than the current recent post, make it the new 
          // most recent post. 
          if ( !isset($most_recent_post['post_gmt_ts']) || ( $post_gmt_ts > $most_recent_post['post_gmt_ts'] ) ) { 
              $most_recent_post = array( 
                  'blog_id' => $blog->userblog_id,  
                  'post_id' => $recent_post['ID'],  
                  'post_date_gmt' => $recent_post['post_date_gmt'],  
                  'post_gmt_ts' => $post_gmt_ts 
 ); 
          } 
      } 
  } 
 
  return $most_recent_post; 
} 
 
// Misc functions 
 
/** 
 * Get the size of a directory. 
 * 
 * A helper function that is used primarily to check whether 
 * a blog has exceeded its allowed upload space. 
 * 
 * @since MU 
 * 
 * @param string $directory Full path of a directory. 
 * @return int Size of the directory in MB. 
 */ 
function get_dirsize( $directory ) { 
  $dirsize = get_transient( 'dirsize_cache' ); 
  if ( is_array( $dirsize ) && isset( $dirsize[ $directory ][ 'size' ] ) ) 
      return $dirsize[ $directory ][ 'size' ]; 
 
  if ( ! is_array( $dirsize ) ) 
      $dirsize = array(); 
 
  // Exclude individual site directories from the total when checking the main site,  
  // as they are subdirectories and should not be counted. 
  if ( is_main_site() ) { 
      $dirsize[ $directory ][ 'size' ] = recurse_dirsize( $directory, $directory . '/sites' ); 
  } else { 
      $dirsize[ $directory ][ 'size' ] = recurse_dirsize( $directory ); 
  } 
 
  set_transient( 'dirsize_cache', $dirsize, HOUR_IN_SECONDS ); 
  return $dirsize[ $directory ][ 'size' ]; 
} 
 
/** 
 * Get the size of a directory recursively. 
 * 
 * Used by get_dirsize() to get a directory's size when it contains 
 * other directories. 
 * 
 * @since MU 
 * @since 4.3.0 $exclude parameter added. 
 * 
 * @param string $directory Full path of a directory. 
 * @param string $exclude   Optional. Full path of a subdirectory to exclude from the total. 
 * @return int|false Size in MB if a valid directory. False if not. 
 */ 
function recurse_dirsize( $directory, $exclude = null ) { 
  $size = 0; 
 
  $directory = untrailingslashit( $directory ); 
 
  if ( ! file_exists( $directory ) || ! is_dir( $directory ) || ! is_readable( $directory ) || $directory === $exclude ) { 
      return false; 
  } 
 
  if ($handle = opendir($directory)) { 
      while(($file = readdir($handle)) !== false) { 
          $path = $directory.'/'.$file; 
          if ($file != '.' && $file != '..') { 
              if (is_file($path)) { 
                  $size += filesize($path); 
              } elseif (is_dir($path)) { 
                  $handlesize = recurse_dirsize( $path, $exclude ); 
                  if ($handlesize > 0) 
                      $size += $handlesize; 
              } 
          } 
      } 
      closedir($handle); 
  } 
  return $size; 
} 
 
/** 
 * Check an array of MIME types against a whitelist. 
 * 
 * WordPress ships with a set of allowed upload filetypes,  
 * which is defined in wp-includes/functions.php in 
 * get_allowed_mime_types(). This function is used to filter 
 * that list against the filetype whitelist provided by Multisite 
 * Super Admins at wp-admin/network/settings.php. 
 * 
 * @since MU 
 * 
 * @param array $mimes 
 * @return array 
 */ 
function check_upload_mimes( $mimes ) { 
  $site_exts = explode( ' ', get_site_option( 'upload_filetypes', 'jpg jpeg png gif' ) ); 
  $site_mimes = array(); 
  foreach ( $site_exts as $ext ) { 
      foreach ( $mimes as $ext_pattern => $mime ) { 
          if ( $ext != '' && strpos( $ext_pattern, $ext ) !== false ) 
              $site_mimes[$ext_pattern] = $mime; 
      } 
  } 
  return $site_mimes; 
} 
 
/** 
 * Update a blog's post count. 
 * 
 * WordPress MS stores a blog's post count as an option so as 
 * to avoid extraneous COUNTs when a blog's details are fetched 
 * with get_site(). This function is called when posts are published 
 * or unpublished to make sure the count stays current. 
 * 
 * @since MU 
 * 
 * @global wpdb $wpdb WordPress database abstraction object. 
 * 
 * @param string $deprecated Not used. 
 */ 
function update_posts_count( $deprecated = '' ) { 
  global $wpdb; 
  update_option( 'post_count', (int) $wpdb->get_var( "SELECT COUNT(ID) FROM {$wpdb->posts} WHERE post_status = 'publish' and post_type = 'post'" ) ); 
} 
 
/** 
 * Logs user registrations. 
 * 
 * @since MU 
 * 
 * @global wpdb $wpdb WordPress database abstraction object. 
 * 
 * @param int $blog_id 
 * @param int $user_id 
 */ 
function wpmu_log_new_registrations( $blog_id, $user_id ) { 
  global $wpdb; 
  $user = get_userdata( (int) $user_id ); 
  if ( $user ) 
      $wpdb->insert( $wpdb->registration_log, array('email' => $user->user_email, 'IP' => preg_replace( '/[^0-9., ]/', '', wp_unslash( $_SERVER['REMOTE_ADDR'] ) ), 'blog_id' => $blog_id, 'date_registered' => current_time('mysql')) ); 
} 
 
/** 
 * Maintains a canonical list of terms by syncing terms created for each blog with the global terms table. 
 * 
 * @since 3.0.0 
 * 
 * @see term_id_filter 
 * 
 * @global wpdb $wpdb WordPress database abstraction object. 
 * @staticvar int $global_terms_recurse 
 * 
 * @param int    $term_id    An ID for a term on the current blog. 
 * @param string $deprecated Not used. 
 * @return int An ID from the global terms table mapped from $term_id. 
 */ 
function global_terms( $term_id, $deprecated = '' ) { 
  global $wpdb; 
  static $global_terms_recurse = null; 
 
  if ( !global_terms_enabled() ) 
      return $term_id; 
 
  // prevent a race condition 
  $recurse_start = false; 
  if ( $global_terms_recurse === null ) { 
      $recurse_start = true; 
      $global_terms_recurse = 1; 
  } elseif ( 10 < $global_terms_recurse++ ) { 
      return $term_id; 
  } 
 
  $term_id = intval( $term_id ); 
  $c = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->terms WHERE term_id = %d", $term_id ) ); 
 
  $global_id = $wpdb->get_var( $wpdb->prepare( "SELECT cat_ID FROM $wpdb->sitecategories WHERE category_nicename = %s", $c->slug ) ); 
  if ( $global_id == null ) { 
      $used_global_id = $wpdb->get_var( $wpdb->prepare( "SELECT cat_ID FROM $wpdb->sitecategories WHERE cat_ID = %d", $c->term_id ) ); 
      if ( null == $used_global_id ) { 
          $wpdb->insert( $wpdb->sitecategories, array( 'cat_ID' => $term_id, 'cat_name' => $c->name, 'category_nicename' => $c->slug ) ); 
          $global_id = $wpdb->insert_id; 
          if ( empty( $global_id ) ) 
              return $term_id; 
      } else { 
          $max_global_id = $wpdb->get_var( "SELECT MAX(cat_ID) FROM $wpdb->sitecategories" ); 
          $max_local_id = $wpdb->get_var( "SELECT MAX(term_id) FROM $wpdb->terms" ); 
          $new_global_id = max( $max_global_id, $max_local_id ) + mt_rand( 100, 400 ); 
          $wpdb->insert( $wpdb->sitecategories, array( 'cat_ID' => $new_global_id, 'cat_name' => $c->name, 'category_nicename' => $c->slug ) ); 
          $global_id = $wpdb->insert_id; 
      } 
  } elseif ( $global_id != $term_id ) { 
      $local_id = $wpdb->get_var( $wpdb->prepare( "SELECT term_id FROM $wpdb->terms WHERE term_id = %d", $global_id ) ); 
      if ( null != $local_id ) { 
          global_terms( $local_id ); 
          if ( 10 < $global_terms_recurse ) { 
              $global_id = $term_id; 
          } 
      } 
  } 
 
  if ( $global_id != $term_id ) { 
      if ( get_option( 'default_category' ) == $term_id ) 
          update_option( 'default_category', $global_id ); 
 
      $wpdb->update( $wpdb->terms, array('term_id' => $global_id), array('term_id' => $term_id) ); 
      $wpdb->update( $wpdb->term_taxonomy, array('term_id' => $global_id), array('term_id' => $term_id) ); 
      $wpdb->update( $wpdb->term_taxonomy, array('parent' => $global_id), array('parent' => $term_id) ); 
 
      clean_term_cache($term_id); 
  } 
  if ( $recurse_start ) 
      $global_terms_recurse = null; 
 
  return $global_id; 
} 
 
/** 
 * Ensure that the current site's domain is listed in the allowed redirect host list. 
 * 
 * @see wp_validate_redirect() 
 * @since MU 
 * 
 * @param array|string $deprecated Not used. 
 * @return array The current site's domain 
 */ 
function redirect_this_site( $deprecated = '' ) { 
  return array( get_network()->domain ); 
} 
 
/** 
 * Check whether an upload is too big. 
 * 
 * @since MU 
 * 
 * @blessed 
 * 
 * @param array $upload 
 * @return string|array If the upload is under the size limit, $upload is returned. Otherwise returns an error message. 
 */ 
function upload_is_file_too_big( $upload ) { 
  if ( ! is_array( $upload ) || defined( 'WP_IMPORTING' ) || get_site_option( 'upload_space_check_disabled' ) ) 
      return $upload; 
 
  if ( strlen( $upload['bits'] )  > ( KB_IN_BYTES * get_site_option( 'fileupload_maxk', 1500 ) ) ) { 
      return sprintf( __( 'This file is too big. Files must be less than %d KB in size.' ) . '<br />', get_site_option( 'fileupload_maxk', 1500 ) ); 
  } 
 
  return $upload; 
} 
 
/** 
 * Add a nonce field to the signup page. 
 * 
 * @since MU 
 */ 
function signup_nonce_fields() { 
  $id = mt_rand(); 
  echo "<input type='hidden' name='signup_form_id' value='{$id}' />"; 
  wp_nonce_field('signup_form_' . $id, '_signup_form', false); 
} 
 
/** 
 * Process the signup nonce created in signup_nonce_fields(). 
 * 
 * @since MU 
 * 
 * @param array $result 
 * @return array 
 */ 
function signup_nonce_check( $result ) { 
  if ( !strpos( $_SERVER[ 'PHP_SELF' ], 'wp-signup.php' ) ) 
      return $result; 
 
  if ( wp_create_nonce('signup_form_' . $_POST[ 'signup_form_id' ]) != $_POST['_signup_form'] ) 
      wp_die( __( 'Please try again.' ) ); 
 
  return $result; 
} 
 
/** 
 * Correct 404 redirects when NOBLOGREDIRECT is defined. 
 * 
 * @since MU 
 */ 
function maybe_redirect_404() { 
  /** 
   * Filters the redirect URL for 404s on the main site. 
   * 
   * The filter is only evaluated if the NOBLOGREDIRECT constant is defined. 
   * 
   * @since 3.0.0 
   * 
   * @param string $no_blog_redirect The redirect URL defined in NOBLOGREDIRECT. 
   */ 
  if ( is_main_site() && is_404() && defined( 'NOBLOGREDIRECT' ) && ( $destination = apply_filters( 'blog_redirect_404', NOBLOGREDIRECT ) ) ) { 
      if ( $destination == '%siteurl%' ) 
          $destination = network_home_url(); 
      wp_redirect( $destination ); 
      exit(); 
  } 
} 
 
/** 
 * Add a new user to a blog by visiting /newbloguser/username/. 
 * 
 * This will only work when the user's details are saved as an option 
 * keyed as 'new_user_x', where 'x' is the username of the user to be 
 * added, as when a user is invited through the regular WP Add User interface. 
 * 
 * @since MU 
 */ 
function maybe_add_existing_user_to_blog() { 
  if ( false === strpos( $_SERVER[ 'REQUEST_URI' ], '/newbloguser/' ) ) 
      return; 
 
  $parts = explode( '/', $_SERVER[ 'REQUEST_URI' ] ); 
  $key = array_pop( $parts ); 
 
  if ( $key == '' ) 
      $key = array_pop( $parts ); 
 
  $details = get_option( 'new_user_' . $key ); 
  if ( !empty( $details ) ) 
      delete_option( 'new_user_' . $key ); 
 
  if ( empty( $details ) || is_wp_error( add_existing_user_to_blog( $details ) ) ) 
      wp_die( sprintf(__('An error occurred adding you to this site. Back to the <a href="%s">homepage</a>.'), home_url() ) ); 
 
  wp_die( sprintf( __( 'You have been added to this site. Please visit the <a href="%s">homepage</a> or <a href="%s">log in</a> using your username and password.' ), home_url(), admin_url() ), __( 'WordPress › Success' ), array( 'response' => 200 ) ); 
} 
 
/** 
 * Add a user to a blog based on details from maybe_add_existing_user_to_blog(). 
 * 
 * @since MU 
 * 
 * @param array $details 
 * @return true|WP_Error|void 
 */ 
function add_existing_user_to_blog( $details = false ) { 
  if ( is_array( $details ) ) { 
      $blog_id = get_current_blog_id(); 
      $result = add_user_to_blog( $blog_id, $details[ 'user_id' ], $details[ 'role' ] ); 
      /** 
       * Fires immediately after an existing user is added to a site. 
       * 
       * @since MU 
       * 
       * @param int   $user_id User ID. 
       * @param mixed $result  True on success or a WP_Error object if the user doesn't exist. 
       */ 
      do_action( 'added_existing_user', $details['user_id'], $result ); 
      return $result; 
  } 
} 
 
/** 
 * Adds a newly created user to the appropriate blog 
 * 
 * To add a user in general, use add_user_to_blog(). This function 
 * is specifically hooked into the {@see 'wpmu_activate_user'} action. 
 * 
 * @since MU 
 * @see add_user_to_blog() 
 * 
 * @param int   $user_id 
 * @param mixed $password Ignored. 
 * @param array $meta 
 */ 
function add_new_user_to_blog( $user_id, $password, $meta ) { 
  if ( !empty( $meta[ 'add_to_blog' ] ) ) { 
      $blog_id = $meta[ 'add_to_blog' ]; 
      $role = $meta[ 'new_role' ]; 
      remove_user_from_blog($user_id, get_network()->site_id); // remove user from main blog. 
      add_user_to_blog( $blog_id, $user_id, $role ); 
      update_user_meta( $user_id, 'primary_blog', $blog_id ); 
  } 
} 
 
/** 
 * Correct From host on outgoing mail to match the site domain 
 * 
 * @since MU 
 * 
 * @param PHPMailer $phpmailer The PHPMailer instance, passed by reference. 
 */ 
function fix_phpmailer_messageid( $phpmailer ) { 
  $phpmailer->Hostname = get_network()->domain; 
} 
 
/** 
 * Check to see whether a user is marked as a spammer, based on user login. 
 * 
 * @since MU 
 * 
 * @param string|WP_User $user Optional. Defaults to current user. WP_User object,  
 *                                or user login name as a string. 
 * @return bool 
 */ 
function is_user_spammy( $user = null ) { 
  if ( ! ( $user instanceof WP_User ) ) { 
      if ( $user ) { 
          $user = get_user_by( 'login', $user ); 
      } else { 
          $user = wp_get_current_user(); 
      } 
  } 
 
  return $user && isset( $user->spam ) && 1 == $user->spam; 
} 
 
/** 
 * Update this blog's 'public' setting in the global blogs table. 
 * 
 * Public blogs have a setting of 1, private blogs are 0. 
 * 
 * @since MU 
 * 
 * @param int $old_value 
 * @param int $value     The new public value 
 */ 
function update_blog_public( $old_value, $value ) { 
  update_blog_status( get_current_blog_id(), 'public', (int) $value ); 
} 
 
/** 
 * Check whether a usermeta key has to do with the current blog. 
 * 
 * @since MU 
 * 
 * @global wpdb $wpdb WordPress database abstraction object. 
 * 
 * @param string $key 
 * @param int    $user_id Optional. Defaults to current user. 
 * @param int    $blog_id Optional. Defaults to current blog. 
 * @return bool 
 */ 
function is_user_option_local( $key, $user_id = 0, $blog_id = 0 ) { 
  global $wpdb; 
 
  $current_user = wp_get_current_user(); 
  if ( $blog_id == 0 ) { 
      $blog_id = $wpdb->blogid; 
  } 
  $local_key = $wpdb->get_blog_prefix( $blog_id ) . $key; 
 
  return isset( $current_user->$local_key ); 
} 
 
/** 
 * Check whether users can self-register, based on Network settings. 
 * 
 * @since MU 
 * 
 * @return bool 
 */ 
function users_can_register_signup_filter() { 
  $registration = get_site_option('registration'); 
  return ( $registration == 'all' || $registration == 'user' ); 
} 
 
/** 
 * Ensure that the welcome message is not empty. Currently unused. 
 * 
 * @since MU 
 * 
 * @param string $text 
 * @return string 
 */ 
function welcome_user_msg_filter( $text ) { 
  if ( !$text ) { 
      remove_filter( 'site_option_welcome_user_email', 'welcome_user_msg_filter' ); 
 
      /** translators: Do not translate USERNAME, PASSWORD, LOGINLINK, SITE_NAME: those are placeholders. */ 
      $text = __( 'Howdy USERNAME,  
 
Your new account is set up. 
 
You can log in with the following information: 
Username: USERNAME 
Password: PASSWORD 
LOGINLINK 
 
Thanks! 
 
--The Team @ SITE_NAME' ); 
      update_site_option( 'welcome_user_email', $text ); 
  } 
  return $text; 
} 
 
/** 
 * Whether to force SSL on content. 
 * 
 * @since 2.8.5 
 * 
 * @staticvar bool $forced_content 
 * 
 * @param bool $force 
 * @return bool True if forced, false if not forced. 
 */ 
function force_ssl_content( $force = '' ) { 
  static $forced_content = false; 
 
  if ( '' != $force ) { 
      $old_forced = $forced_content; 
      $forced_content = $force; 
      return $old_forced; 
  } 
 
  return $forced_content; 
} 
 
/** 
 * Formats a URL to use https. 
 * 
 * Useful as a filter. 
 * 
 * @since 2.8.5 
 * 
 * @param string $url URL 
 * @return string URL with https as the scheme 
 */ 
function filter_SSL( $url ) { 
  if ( ! is_string( $url ) ) 
      return get_bloginfo( 'url' ); // Return home blog url with proper scheme 
 
  if ( force_ssl_content() && is_ssl() ) 
      $url = set_url_scheme( $url, 'https' ); 
 
  return $url; 
} 
 
/** 
 * Schedule update of the network-wide counts for the current network. 
 * 
 * @since 3.1.0 
 */ 
function wp_schedule_update_network_counts() { 
  if ( !is_main_site() ) 
      return; 
 
  if ( ! wp_next_scheduled('update_network_counts') && ! wp_installing() ) 
      wp_schedule_event(time(), 'twicedaily', 'update_network_counts'); 
} 
 
/** 
 *  Update the network-wide counts for the current network. 
 * 
 *  @since 3.1.0 
 */ 
function wp_update_network_counts() { 
  wp_update_network_user_counts(); 
  wp_update_network_site_counts(); 
} 
 
/** 
 * Update the count of sites for the current network. 
 * 
 * If enabled through the {@see 'enable_live_network_counts'} filter, update the sites count 
 * on a network when a site is created or its status is updated. 
 * 
 * @since 3.7.0 
 */ 
function wp_maybe_update_network_site_counts() { 
  $is_small_network = ! wp_is_large_network( 'sites' ); 
 
  /** 
   * Filters whether to update network site or user counts when a new site is created. 
   * 
   * @since 3.7.0 
   * 
   * @see wp_is_large_network() 
   * 
   * @param bool   $small_network Whether the network is considered small. 
   * @param string $context       Context. Either 'users' or 'sites'. 
   */ 
  if ( ! apply_filters( 'enable_live_network_counts', $is_small_network, 'sites' ) ) 
      return; 
 
  wp_update_network_site_counts(); 
} 
 
/** 
 * Update the network-wide users count. 
 * 
 * If enabled through the {@see 'enable_live_network_counts'} filter, update the users count 
 * on a network when a user is created or its status is updated. 
 * 
 * @since 3.7.0 
 */ 
function wp_maybe_update_network_user_counts() { 
  $is_small_network = ! wp_is_large_network( 'users' ); 
 
  /** This filter is documented in wp-includes/ms-functions.php */ 
  if ( ! apply_filters( 'enable_live_network_counts', $is_small_network, 'users' ) ) 
      return; 
 
  wp_update_network_user_counts(); 
} 
 
/** 
 * Update the network-wide site count. 
 * 
 * @since 3.7.0 
 * 
 * @global wpdb $wpdb WordPress database abstraction object. 
 */ 
function wp_update_network_site_counts() { 
  global $wpdb; 
 
  $count = get_sites( array( 
      'network_id' => $wpdb->siteid,  
      'spam' => 0,  
      'deleted' => 0,  
      'archived' => 0,  
      'count' => true,  
 ) ); 
 
  update_site_option( 'blog_count', $count ); 
} 
 
/** 
 * Update the network-wide user count. 
 * 
 * @since 3.7.0 
 * 
 * @global wpdb $wpdb WordPress database abstraction object. 
 */ 
function wp_update_network_user_counts() { 
  global $wpdb; 
 
  $count = $wpdb->get_var( "SELECT COUNT(ID) as c FROM $wpdb->users WHERE spam = '0' AND deleted = '0'" ); 
  update_site_option( 'user_count', $count ); 
} 
 
/** 
 * Returns the space used by the current blog. 
 * 
 * @since 3.5.0 
 * 
 * @return int Used space in megabytes 
 */ 
function get_space_used() { 
  /** 
   * Filters the amount of storage space used by the current site. 
   * 
   * @since 3.5.0 
   * 
   * @param int|bool $space_used The amount of used space, in megabytes. Default false. 
   */ 
  $space_used = apply_filters( 'pre_get_space_used', false ); 
  if ( false === $space_used ) { 
      $upload_dir = wp_upload_dir(); 
      $space_used = get_dirsize( $upload_dir['basedir'] ) / MB_IN_BYTES; 
  } 
 
  return $space_used; 
} 
 
/** 
 * Returns the upload quota for the current blog. 
 * 
 * @since MU 
 * 
 * @return int Quota in megabytes 
 */ 
function get_space_allowed() { 
  $space_allowed = get_option( 'blog_upload_space' ); 
 
  if ( ! is_numeric( $space_allowed ) ) 
      $space_allowed = get_site_option( 'blog_upload_space' ); 
 
  if ( ! is_numeric( $space_allowed ) ) 
      $space_allowed = 100; 
 
  /** 
   * Filters the upload quota for the current site. 
   * 
   * @since 3.7.0 
   * 
   * @param int $space_allowed Upload quota in megabytes for the current blog. 
   */ 
  return apply_filters( 'get_space_allowed', $space_allowed ); 
} 
 
/** 
 * Determines if there is any upload space left in the current blog's quota. 
 * 
 * @since 3.0.0 
 * 
 * @return int of upload space available in bytes 
 */ 
function get_upload_space_available() { 
  $allowed = get_space_allowed(); 
  if ( $allowed < 0 ) { 
      $allowed = 0; 
  } 
  $space_allowed = $allowed * MB_IN_BYTES; 
  if ( get_site_option( 'upload_space_check_disabled' ) ) 
      return $space_allowed; 
 
  $space_used = get_space_used() * MB_IN_BYTES; 
 
  if ( ( $space_allowed - $space_used ) <= 0 ) 
      return 0; 
 
  return $space_allowed - $space_used; 
} 
 
/** 
 * Determines if there is any upload space left in the current blog's quota. 
 * 
 * @since 3.0.0 
 * @return bool True if space is available, false otherwise. 
 */ 
function is_upload_space_available() { 
  if ( get_site_option( 'upload_space_check_disabled' ) ) 
      return true; 
 
  return (bool) get_upload_space_available(); 
} 
 
/** 
 * Filters the maximum upload file size allowed, in bytes. 
 * 
 * @since 3.0.0 
 * 
 * @param  int $size Upload size limit in bytes. 
 * @return int       Upload size limit in bytes. 
 */ 
function upload_size_limit_filter( $size ) { 
  $fileupload_maxk = KB_IN_BYTES * get_site_option( 'fileupload_maxk', 1500 ); 
  if ( get_site_option( 'upload_space_check_disabled' ) ) 
      return min( $size, $fileupload_maxk ); 
 
  return min( $size, $fileupload_maxk, get_upload_space_available() ); 
} 
 
/** 
 * Whether or not we have a large network. 
 * 
 * The default criteria for a large network is either more than 10, 000 users or more than 10, 000 sites. 
 * Plugins can alter this criteria using the {@see 'wp_is_large_network'} filter. 
 * 
 * @since 3.3.0 
 * @param string $using 'sites or 'users'. Default is 'sites'. 
 * @return bool True if the network meets the criteria for large. False otherwise. 
 */ 
function wp_is_large_network( $using = 'sites' ) { 
  if ( 'users' == $using ) { 
      $count = get_user_count(); 
      /** 
       * Filters whether the network is considered large. 
       * 
       * @since 3.3.0 
       * 
       * @param bool   $is_large_network Whether the network has more than 10000 users or sites. 
       * @param string $component        The component to count. Accepts 'users', or 'sites'. 
       * @param int    $count            The count of items for the component. 
       */ 
      return apply_filters( 'wp_is_large_network', $count > 10000, 'users', $count ); 
  } 
 
  $count = get_blog_count(); 
  /** This filter is documented in wp-includes/ms-functions.php */ 
  return apply_filters( 'wp_is_large_network', $count > 10000, 'sites', $count ); 
} 
 
/** 
 * Retrieves a list of reserved site on a sub-directory Multisite install. 
 * 
 * @since 4.4.0 
 * 
 * @return array $names Array of reserved subdirectory names. 
 */ 
function get_subdirectory_reserved_names() { 
  $names = array( 
      'page', 'comments', 'blog', 'files', 'feed', 'wp-admin',  
      'wp-content', 'wp-includes', 'wp-json', 'embed' 
 ); 
 
  /** 
   * Filters reserved site names on a sub-directory Multisite install. 
   * 
   * @since 3.0.0 
   * @since 4.4.0 'wp-admin', 'wp-content', 'wp-includes', 'wp-json', and 'embed' were added 
   *              to the reserved names list. 
   * 
   * @param array $subdirectory_reserved_names Array of reserved names. 
   */ 
  return apply_filters( 'subdirectory_reserved_names', $names ); 
}