[Jon]

public function addCarSearch($in_var)
{
    $fh= fopen('log.txt','w');
    fputs($fh,\XLite\Core\Request::getInstance()->make);
    fputs($fh,serialize($in_var));
    fclose($fh);
    return \XLite\Core\Request::getInstance()->make;
}

addCarSearch($_POST);