Variant f_simplexml_load_file(const String& filename,
                              const String& class_name /* = "SimpleXMLElement" */,
                              int64_t options /* = 0 */, const String& ns /* = "" */,
                              bool is_prefix /* = false */) {
  String str = f_file_get_contents(filename);
  return f_simplexml_load_string(str, class_name, options, ns, is_prefix);
}
Variant f_simplexml_load_file(const String& filename,
                              const String& class_name  ,
                              int64_t options  , const String& ns  ,
                              bool is_prefix  ) {
  String str = f_file_get_contents(filename);
  return f_simplexml_load_string(str, class_name, options, ns, is_prefix);
}