kernel/lib/Debug.php
private static function _initLogFile()
    {
        self::$_sFileLog = str_replace(DIRECTORY_SEPARATOR.'kernel'.DIRECTORY_SEPARATOR.'lib', '', __DIR__).DIRECTORY_SEPARATOR.
            "data".DIRECTORY_SEPARATOR."log".DIRECTORY_SEPARATOR."php-error.log";

        ini_set("log_errors", 1);
        ini_set("error_log", self::$_sFileLog);

        if (file_exists(self::$_sFileLog) === false) { file_put_contents(self::$_sFileLog, ''); }
    }
private static function _initLogFile()
    {
        self::$_sFileLog = str_replace(DIRECTORY_SEPARATOR.'kernel'.DIRECTORY_SEPARATOR.'lib', '', __DIR__).DIRECTORY_SEPARATOR.
            "data".DIRECTORY_SEPARATOR."log".DIRECTORY_SEPARATOR."php-error.log";

        ini_set("log_errors", 1);
        ini_set("error_log", self::$_sFileLog);

        if (file_exists(self::$_sFileLog) === false) { file_put_contents(self::$_sFileLog, ''); }
    }
init the log file (error_log)

@access private
@return void