所有站点的最新帖子（WordPress Multisite）

Posted 2021-02-24

A function to query the 10 most recent posts on a multisite WordPress installation

function recent_mu_posts( $howMany = 10 ) {
 
  global $wpdb;
  global $table_prefix;
 
  // get an array of the table names that our posts will be in
  // we do this by first getting all of our blog ids and then forming the name of the 
  // table and putting it into an array
  $rows = $wpdb->get_results( "SELECT blog_id from $wpdb->blogs WHERE
    public = '1' AND archived = '0' AND mature = '0' AND spam = '0' AND deleted = '0';" );
 
  if ( $rows ) :
 
    $blogPostTableNames = array();
    foreach ( $rows as $row ) :
 
      $blogPostTableNames[$row->blog_id] = $wpdb->get_blog_prefix( $row->blog_id ) . 'posts';
 
    endforeach;
    # print_r($blogPostTableNames); # debugging code
 
    // now we need to do a query to get all the posts from all our blogs
    // with limits applied
    if ( count( $blogPostTableNames ) > 0 ) :
 
      $query = '';
      $i = 0;
 
      foreach ( $blogPostTableNames as $blogId => $tableName ) :
 
        if ( $i > 0 ) :
        $query.= ' UNION ';
        endif;
 
        $query.= " (SELECT ID, post_date, $blogId as `blog_id` FROM $tableName WHERE post_status = 'publish' AND post_type = 'post')";
        $i++;
 
      endforeach;
 
      $query.= " ORDER BY post_date DESC LIMIT 0,$howMany;";
      # echo $query; # debugging code
      $rows = $wpdb->get_results( $query );
 
      // now we need to get each of our posts into an array and return them
      if ( $rows ) :
 
        $posts = array();
        foreach ( $rows as $row ) :
        $posts[] = get_blog_post( $row->blog_id, $row->ID );
        endforeach;
        # echo "<pre>"; print_r($posts); echo "</pre>"; exit; # debugging code
        return $posts;
 
      else:
 
        return "Error: No Posts found";
 
      endif;
 
    else:
 
       return "Error: Could not find blogs in the database";
 
    endif;
 
  else:
 
    return "Error: Could not find blogs";
 
  endif;
}