static function trace($data = '', $file_name = '')
{
is_object($data) and $data = help::object_array($data);
is_array($data) and $data = print_r($data, true);
empty($file_name) and $file_name = date('Y_m_d') . '.log';
$file = fopen(LOG_TRACE . $file_name, 'a+');
flock($file, LOCK_EX);
fwrite($file, $data . PHP_EOL);
flock($file, LOCK_UN);
fclose($file);
}