staylor / WordPress

 * @param int $post_id Post ID.

 * @return array

 */

function get_pung( $post_id ) {

	global $wpdb;

	$pung = $wpdb->get_var( $wpdb->prepare( "SELECT pinged FROM $wpdb->posts WHERE ID = %d", $post_id ));

	$pung = trim($pung);

	$pung = preg_split('/\s/', $pung);

	/**

	 * Filters the list of already-pinged URLs for the given post.

	 *

	 * @since 2.0.0

	 *

	 * @param array $pung Array of URLs already pinged for the given post.

	 */

	return apply_filters( 'get_pung', $pung );

}

/**

 * Retrieve URLs that need to be pinged.

 * @param int $post_id Post ID

 * @return array

 */

function get_to_ping( $post_id ) {

	global $wpdb;

	$to_ping = $wpdb->get_var( $wpdb->prepare( "SELECT to_ping FROM $wpdb->posts WHERE ID = %d", $post_id ));

	$to_ping = sanitize_trackback_urls( $to_ping );

	$to_ping = preg_split('/\s/', $to_ping, -1, PREG_SPLIT_NO_EMPTY);

	/**

	 * Filters the list of URLs yet to ping for the given post.

	 *

	 * @since 2.0.0

	 *

	 * @param array $to_ping List of URLs yet to ping.

	 */

	return apply_filters( 'get_to_ping', $to_ping );

}

/**

 * Do trackbacks for a list of URLs.