/**     * 检测用户当前浏览器     * @return boolean 是否ie浏览器     */    function chk_ie_browser() {        $userbrowser = $_SERVER['HTTP_USER_AGENT'];        if ( preg_match( '/MSIE/i', $userbrowser ) ) {            $usingie = true;        } else {            $usingie = false;        }        return $usingie;    }