Get Page Template for Post in WordPress Admin

get-page-template-for-post-in-wordpress-admin-2.php

<?php

/**
 * Return true if page template is being used, else false.
 *
 * @param  string $page_template The filename of the template to check against.
 *                               Example: 'abc-123.php'.
 *
 * @return bool                  Whether page template is being used.
 */
function km_is_page_template( $page_template ) {

   global $post;

   if ( ! $post ) {
      return false;
   }

   return $page_template === get_post_meta( $post->ID, '_wp_page_template', true );
}