php怎么判断手机客户端访问？

2. // check if wap
3. function check_wap(){
4. if(stristr($_SERVER['HTTP_VIA'],"wap")){// 先检查是否为wap代理，准确度高
5. return true;
6. }elseif(strpos(strtoupper($_SERVER['HTTP_ACCEPT']),"VND.WAP.WML") > 0){// 检查浏览器是否接受 WML.
7. return true;
8. }elseif(preg_match('/(blackberry|configuration\/cldc|hp |hp-|htc |htc_|htc-|iemobile|kindle|midp|mmp|motorola|mobile|nokia|opera mini|opera |Googlebot-Mobile|YahooSeeker\/M1A1-R2D2|android|iphone|ipod|mobi|palm|palmos|pocket|portalmmm|ppc;|smartphone|sonyericsson|sqh|spv|symbian|treo|up.browser|up.link|vodafone|windows ce|xda |xda_)/i', $_SERVER['HTTP_USER_AGENT'])){//检查USER_AGENT
9. return true;
10. }else{
11. return false;
12. }
13. }

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