unique-title-checker-across-post-types.php

<?php
/**
 * Unique Title Checker Across Post Types
 *
 * @package     unique-title-checker-across-post-types
 * @author      Bernhard Kau
 * @license     GPLv3
 *
 * @wordpress-plugin
 * Plugin Name: Unique Title Checker Across Post Types
 * Plugin URI: https://gist.github.com/2ndkauboy/fe42bb2815499a8ad38a3b5403ecd57a
 * Description: Changes the query for the "Unique Title Checker" plugin to check for duplicate title in any post type
 * Version: 1.0.0
 * Author: Bernhard Kau
 * Author URI: http://kau-boys.de
 * Text Domain: unique-title-checker-across-post-types
 * License: GPLv3
 * License URI: http://www.gnu.org/licenses/gpl-3.0
 */

/**
 * Remove the filter on the post type so the uniqueness is checked against all post types.
 *
 * @param array $args The WP_Query arguments for the uniqueness query.
 *
 * @return array
 */
function unique_title_checker_across_post_types_arguments( $args ) {
	unset( $args['post_type'] );

	return $args;
}
add_filter( 'unique_title_checker_arguments', 'unique_title_checker_across_post_types_arguments' );