WordPress - Get ID from Slug

functions.php

/** 
 * get_id_from_slug
 * 
 * This method is utilized for returning the post id from the slug
 * 
 * @since 7.3
 * @access public
 * @author Kevin Pirnie <[email protected]>
 * @package Kevin's Framework
 * 
 * @param string $_the_slug The posts slug
 * @param string $_post_type The post type
 * 
 * @return int Returns the ID
 * 
*/
public function get_id_from_slug( string $_the_slug, string $_post_type = 'page' ) : int {

	// hold the return
	$_ret = 0;

	// see if we've already got this in cache
	$_ret = wp_cache_get( "kfw_id_from_slug_" . $_the_slug , "kfw_id_from_slug_" . $_the_slug );

	// if we have it in our cache already
	if( $_ret ) {

		// just return it
		return $_ret;

	// we don't    
	} else {

		// our query arguments
		$_args = array(
			'name' => $_the_slug,
			'post_type' => $_post_type, 
			'post_status' => 'any',
			'posts_per_page' => 1, 
		);

		// run the query
		$_qry = new WP_Query( $_args );
		$_rs = $_qry -> get_posts( );

		// make sure we have something here
		if( $_rs ) {

			// return the post id
			$_ret = $_rs[0] -> ID;

		// we don't
		}
		
		// cache it for an hour
		wp_cache_add( "kfw_id_from_slug_" . $_the_slug, $_ret, "kfw_id_from_slug_" . $_the_slug, HOUR_IN_SECONDS );
		
	}
	
	// return
	return $_ret;

}