Get Page Template for Post in WordPress Admin

You can get the filename of the page template that the post in the WordPress admin is set to using:

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

The function below gets the filename of the page template, then returns true if it matches the desired page template, or false if not. This is useful if you want to run code in the WordPress admin only for posts that are set to use a particular page template. Just replace abc-123.php with the filename of the template you want to check against.

/**
 * Return true if abc-123 page template is being used, else false.
 *
 * @return bool Whether abc-123 page template is being used.
 */
function km_is_abc_123_template() {

   global $post;

   if ( ! $post ) {
      return false;
   }

   return 'abc-123.php' === get_post_meta( $post->ID, '_wp_page_template', true );
}

Here’s a more general version of that function that allows you to pass in the filename of a particular page template to check against:

/**
 * 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 );
}