private static function loadIntoCategory()
    {
        //func_get_arg to avoid override any variable or access to $this from language file 
        ${func_get_arg(0)->getNameOfLanguageVariable()} = array();
        require_once func_get_arg(1);
        if (!empty(${func_get_arg(0)->getNameOfLanguageVariable()})) {
            func_get_arg(0)->lang[func_get_arg(2)][func_get_arg(0)->getCategory()] = ${func_get_arg(0)->getNameOfLanguageVariable()};
        }
    }