PHP实现页面的跳转及非微信浏览器禁止访问

<?php
/*
* Writed by Luo Ning
* Blog: http://www.luoning.me
*/
$useragent = addslashes($_SERVER['HTTP_USER_AGENT']);
if(strpos($useragent, 'MicroMessenger') === false && strpos($useragent, 'Windows Phone') === false ){
///echo " <center>非微信浏览器禁止访问</center>";
header("Location: http://www.luoning.me");
exit;

}else{ 
echo "真乖，就是要用微信访问嘛！";
}

?>