function genesis_autoload_register_psr4( $class_name ) {

  // If the class being requested does not start with our prefix, we know it's not one in our project.
  if ( 0 !== strpos( $class_name, 'StudioPress\Genesis' ) ) {
    return null;
  }

  $file_name = str_replace( [ 'StudioPress\\', 'Genesis\\', '\\' ], [ '', '', '/' ], $class_name );
  $file      = get_template_directory() . '/lib/classes/' . $file_name . '.php';

  if ( file_exists( $file ) ) {
    require $file;
  }

  return $file;
}