הצגת התמונה הראשית ברשימת הפוסטים בדשבורד ללא תוסף

				
					if ( !function_exists('AddThumbColumn') && function_exists('add_theme_support') ) {  
   
    // for post and page  
    add_theme_support('post-thumbnails', array( 'post', 'page' ) );  
   
    function AddThumbColumn($cols) {  
        $cols['thumbnail'] = __('Thumbnail');  
        return $cols;  
    }  
   
    function AddThumbValue($column_name, $post_id) {  
   
            $width = (int) 55;  
            $height = (int) 55;  
   
            if ( 'thumbnail' == $column_name ) {  
                // thumbnail of WP 2.9  
                $thumbnail_id = get_post_meta( $post_id, '_thumbnail_id', true );  
                // image from gallery  
                $attachments = get_children( array('post_parent' => $post_id, 'post_type' => 'attachment', 'post_mime_type' => 'image') );  
                if ($thumbnail_id)  
                    $thumb = wp_get_attachment_image( $thumbnail_id, array($width, $height), true );  
                elseif ($attachments) {  
                    foreach ( $attachments as $attachment_id => $attachment ) {  
                        $thumb = wp_get_attachment_image( $attachment_id, array($width, $height), true );  
                    }  
                }  
                    if ( isset($thumb) && $thumb ) {  
                        echo $thumb;  
                    } else {  
                        echo __('None');  
                    }  
            }  
    }  
   
    // for posts  
    add_filter( 'manage_posts_columns', 'AddThumbColumn' );  
    add_action( 'manage_posts_custom_column', 'AddThumbValue', 10, 2 );  
   
    // for pages  
    add_filter( 'manage_pages_columns', 'AddThumbColumn' );  
    add_action( 'manage_pages_custom_column', 'AddThumbValue', 10, 2 );  
   }