public static function invalidate($pathname) {
    clearstatcache(TRUE, $pathname);

    // Check if the Zend OPcache is enabled and if so invalidate the file.
    if (function_exists('opcache_invalidate')) {
      opcache_invalidate($pathname, TRUE);
    }
    // If apcu extension is enabled in PHP 5.5 or greater it emulates apc.
    // This is to provide an easy upgrade path if you are using apc's user
    // caching however the emulation does not extend to opcode caching.
    // Therefore we need to check if the function exists as well.
    if (extension_loaded('apc') && function_exists('apc_delete_file')) {
      // apc_delete_file() throws a PHP warning in case the specified file was
      // not compiled yet.
      // @see http://php.net/manual/en/function.apc-delete-file.php
      @apc_delete_file($pathname);
    }
  }