public static function log($message, $file = __FILE__, $line = __LINE__)
 {
     if (self::$log_time === null) {
         self::$log_time = date('Y-m-d H:i:s');
     }
     if (!self::$ts_start_plugin) {
         self::$ts_start_plugin = time();
     }
     $sec = time() - self::$ts_start_plugin;
     $f = fopen(Tilda::get_upload_dir() . '/log.txt', 'a');
     fwrite($f, "[" . self::$log_time . " - {$sec} s] " . $message . " in [file: {$file}, line: {$line}]\n");
     fclose($f);
 }