/core/actions/export.php

<?php 
 
/** 
*  Export 
* 
*  @description:  
*  @since: 3.6 
*  @created: 25/01/13 
*/ 
 
// Exit if accessed directly 
if ( !defined( 'ABSPATH' ) ) exit; 
 
 
// vars 
$defaults = array( 
  'acf_posts' => array(),  
  'nonce' => '' 
); 
$my_options = array_merge( $defaults, $_POST ); 
 
 
// validate nonce 
if( !wp_verify_nonce($my_options['nonce'], 'export') ) 
{ 
  wp_die(__("Error", 'acf')); 
} 
 
 
// check for posts 
if( empty($my_options['acf_posts']) ) 
{ 
  wp_die(__("No ACF groups selected", 'acf')); 
} 
 
 
/** 
 * Version number for the export format. 
 * 
 * Bump this when something changes that might affect compatibility. 
 * 
 * @since 2.5.0 
 */ 
define( 'WXR_VERSION', '1.1' ); 
 
 
/** 
*  fix_line_breaks 
* 
*  This function will loop through all array pieces and correct double line breaks from DB to XML 
* 
*  @type    function 
*  @date    2/12/2013 
*  @since    5.0.0 
* 
*  @param    $v (mixed) 
*  @return    $v (mixed) 
*/ 
 
function fix_line_breaks( $v ) 
{ 
  if( is_array($v) ) 
  { 
      foreach( array_keys($v) as $k ) 
      { 
          $v[ $k ] = fix_line_breaks( $v[ $k ] ); 
      } 
  } 
  elseif( is_string($v) ) 
  { 
      $v = str_replace("\r\n", "\r", $v); 
  } 
   
  return $v; 
} 
 
 
/** 
 * Wrap given string in XML CDATA tag. 
 * 
 * @since 2.1.0 
 * 
 * @param string $str String to wrap in XML CDATA tag. 
 */ 
function wxr_cdata( $str ) { 
  if ( seems_utf8( $str ) == false ) 
      $str = utf8_encode( $str ); 
 
  // $str = ent2ncr(esc_html($str)); 
  $str = "<![CDATA[$str" . ( ( substr( $str, -1 ) == ']' ) ? ' ' : '' ) . ']]>'; 
 
  return $str; 
} 
 
/** 
 * Return the URL of the site 
 * 
 * @since 2.5.0 
 * 
 * @return string Site URL. 
 */ 
function wxr_site_url() { 
  // ms: the base url 
  if ( is_multisite() ) 
      return network_home_url(); 
  // wp: the blog url 
  else 
      return get_site_url(); 
} 
 
/** 
 * Output a tag_description XML tag from a given tag object 
 * 
 * @since 2.3.0 
 * 
 * @param object $tag Tag Object 
 */ 
function wxr_tag_description( $tag ) { 
  if ( empty( $tag->description ) ) 
      return; 
 
  echo '<wp:tag_description>' . wxr_cdata( $tag->description ) . '</wp:tag_description>'; 
} 
 
/** 
 * Output a term_name XML tag from a given term object 
 * 
 * @since 2.9.0 
 * 
 * @param object $term Term Object 
 */ 
function wxr_term_name( $term ) { 
  if ( empty( $term->name ) ) 
      return; 
 
  echo '<wp:term_name>' . wxr_cdata( $term->name ) . '</wp:term_name>'; 
} 
 
/** 
 * Output a term_description XML tag from a given term object 
 * 
 * @since 2.9.0 
 * 
 * @param object $term Term Object 
 */ 
function wxr_term_description( $term ) { 
  if ( empty( $term->description ) ) 
      return; 
 
  echo '<wp:term_description>' . wxr_cdata( $term->description ) . '</wp:term_description>'; 
} 
 
/** 
 * Output list of authors with posts 
 * 
 * @since 3.1.0 
 */ 
function wxr_authors_list() { 
  global $wpdb; 
 
  $authors = array(); 
  $results = $wpdb->get_results( "SELECT DISTINCT post_author FROM $wpdb->posts" ); 
  foreach ( (array) $results as $result ) 
      $authors[] = get_userdata( $result->post_author ); 
 
  $authors = array_filter( $authors ); 
 
  foreach( $authors as $author ) { 
      echo "\t<wp:author>"; 
      echo '<wp:author_id>' . $author->ID . '</wp:author_id>'; 
      echo '<wp:author_login>' . $author->user_login . '</wp:author_login>'; 
      echo '<wp:author_email>' . $author->user_email . '</wp:author_email>'; 
      echo '<wp:author_display_name>' . wxr_cdata( $author->display_name ) . '</wp:author_display_name>'; 
      echo '<wp:author_first_name>' . wxr_cdata( $author->user_firstname ) . '</wp:author_first_name>'; 
      echo '<wp:author_last_name>' . wxr_cdata( $author->user_lastname ) . '</wp:author_last_name>'; 
      echo "</wp:author>\n"; 
  } 
} 
 
header( 'Content-Description: File Transfer' ); 
header( 'Content-Disposition: attachment; filename=advanced-custom-field-export.xml' ); 
header( 'Content-Type: text/xml; charset=' . get_option( 'blog_charset' ), true ); 
 
 
echo '<?xml version="1.0" encoding="' . get_bloginfo('charset') . "\" ?>\n"; 
 
?> 
<!-- This is a WordPress eXtended RSS file generated by WordPress as an export of your site. --> 
<!-- It contains information about your site's posts, pages, comments, categories, and other content. --> 
<!-- You may use this file to transfer that content from one site to another. --> 
<!-- This file is not intended to serve as a complete backup of your site. --> 
 
<!-- To import this information into a WordPress site follow these steps: --> 
<!-- 1. Log in to that site as an administrator. --> 
<!-- 2. Go to Tools: Import in the WordPress admin panel. --> 
<!-- 3. Install the "WordPress" importer from the list. --> 
<!-- 4. Activate & Run Importer. --> 
<!-- 5. Upload this file using the form provided on that page. --> 
<!-- 6. You will first be asked to map the authors in this export file to users --> 
<!--    on the site. For each author, you may choose to map to an --> 
<!--    existing user on the site or to create a new user. --> 
<!-- 7. WordPress will then import each of the posts, pages, comments, categories, etc. --> 
<!--    contained in this file into your site. --> 
 
<?php the_generator( 'export' ); ?> 
<rss version="2.0" 
  xmlns:excerpt="http://wordpress.org/export/<?php echo WXR_VERSION; ?>/excerpt/" 
  xmlns:content="http://purl.org/rss/1.0/modules/content/" 
  xmlns:wfw="http://wellformedweb.org/CommentAPI/" 
  xmlns:dc="http://purl.org/dc/elements/1.1/" 
  xmlns:wp="http://wordpress.org/export/<?php echo WXR_VERSION; ?>/" 
> 
 
<channel> 
  <title><?php bloginfo_rss( 'name' ); ?></title> 
  <link><?php bloginfo_rss( 'url' ); ?></link> 
  <description><?php bloginfo_rss( 'description' ); ?></description> 
  <pubDate><?php echo date( 'D, d M Y H:i:s +0000' ); ?></pubDate> 
  <language><?php echo get_option( 'rss_language' ); ?></language> 
  <wp:wxr_version><?php echo WXR_VERSION; ?></wp:wxr_version> 
  <wp:base_site_url><?php echo wxr_site_url(); ?></wp:base_site_url> 
  <wp:base_blog_url><?php bloginfo_rss( 'url' ); ?></wp:base_blog_url> 
<?php wxr_authors_list(); ?> 
<?php if ( $my_options['acf_posts'] ) { 
 
  global $wp_query, $wpdb, $post; 
  $wp_query->in_the_loop = true; // Fake being in the loop. 
   
  // create SQL with %d placeholders 
  $where = 'WHERE ID IN (' . substr(str_repeat('%d, ', count($my_options['acf_posts'])), 0, -1) . ')'; 
   
  // now prepare the SQL based on the %d + $_POST data 
  $posts = $wpdb->get_results( $wpdb->prepare("SELECT * FROM {$wpdb->posts} $where", $my_options['acf_posts'])); 
 
  // Begin Loop 
  foreach ( $posts as $post ) { 
      setup_postdata( $post ); 
?> 
  <item> 
      <title><?php echo apply_filters( 'the_title_rss', $post->post_title ); ?></title> 
      <link><?php the_permalink_rss() ?></link> 
      <pubDate><?php echo mysql2date( 'D, d M Y H:i:s +0000', get_post_time( 'Y-m-d H:i:s', true ), false ); ?></pubDate> 
      <dc:creator><?php echo get_the_author_meta( 'login' ); ?></dc:creator> 
      <guid isPermaLink="false"><?php esc_url( the_guid() ); ?></guid> 
      <wp:post_id><?php echo $post->ID; ?></wp:post_id> 
      <wp:post_date><?php echo $post->post_date; ?></wp:post_date> 
      <wp:post_date_gmt><?php echo $post->post_date_gmt; ?></wp:post_date_gmt> 
      <wp:comment_status><?php echo $post->comment_status; ?></wp:comment_status> 
      <wp:ping_status><?php echo $post->ping_status; ?></wp:ping_status> 
      <wp:post_name><?php echo $post->post_name; ?></wp:post_name> 
      <wp:status><?php echo $post->post_status; ?></wp:status> 
      <wp:post_parent><?php echo $post->post_parent; ?></wp:post_parent> 
      <wp:menu_order><?php echo $post->menu_order; ?></wp:menu_order> 
      <wp:post_type><?php echo $post->post_type; ?></wp:post_type> 
      <wp:post_password><?php echo $post->post_password; ?></wp:post_password> 
<?php    $postmeta = $wpdb->get_results( $wpdb->prepare( "SELECT * FROM $wpdb->postmeta WHERE post_id = %d", $post->ID ) ); 
      foreach( $postmeta as $meta ) : if ( $meta->meta_key != '_edit_lock' ) :  
           
          $meta->meta_value = maybe_unserialize( $meta->meta_value ); 
              $meta->meta_value = fix_line_breaks( $meta->meta_value ); 
          $meta->meta_value = maybe_serialize( $meta->meta_value ); 
                       
      ?> 
      <wp:postmeta> 
          <wp:meta_key><?php echo $meta->meta_key; ?></wp:meta_key> 
          <wp:meta_value><?php echo wxr_cdata( $meta->meta_value ); ?></wp:meta_value> 
      </wp:postmeta> 
<?php    endif; endforeach; ?> 
  </item> 
<?php 
  } 
}  
?> 
</channel> 
</rss>