Remove custom fields

Hi and thanks for the great plugin.

If anyone needs to remove the custom fields from the “all” option use this in functions.php:

/**
 * Remove the custom fields from inserted post.
 *
 * @param $key
 */
function remove_custom_fields($key) {
  $key = '';
  return $key;
}
add_filter( 'the_meta_key', 'remove_custom_fields' );