php判断手机浏览还是web浏览，并执行相应的动作

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正好需要，在网上找了好久，记录一下

 function isMobile(){

     $useragent=isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : '';

     $useragent_commentsblock=preg_match('|\(.*?\)|',$useragent,$matches)>0?$matches[0]:'';

     function CheckSubstrs($substrs,$text){

         foreach($substrs as $substr)

             if(false!==strpos($text,$substr)){

                 return true;

             }

             return false;

     }

     $mobile_os_list=array('Google Wireless Transcoder','Windows CE','WindowsCE','Symbian','Android','armv6l','armv5','Mobile','CentOS','mowser','AvantGo','Opera Mobi','J2ME/MIDP','Smartphone','Go.Web','Palm','iPAQ');

     $mobile_token_list=array('Profile/MIDP','Configuration/CLDC-','160×160','176×220','240×240','240×320','320×240','UP.Browser','UP.Link','SymbianOS','PalmOS','PocketPC','SonyEricsson','Nokia','BlackBerry','Vodafone','BenQ','Novarra-Vision','Iris','NetFront','HTC_','Xda_','SAMSUNG-SGH','Wapaka','DoCoMo','iPhone','iPod');  

     $found_mobile=CheckSubstrs($mobile_os_list,$useragent_commentsblock) ||

               CheckSubstrs($mobile_token_list,$useragent);  

     if ($found_mobile){

         return true;

     }else{

         return false;

     }

 }

 if (isMobile()){

     header('location: ./app/index.php');//如果为手机端，执行跳转

 }

 else{

     header('location: ./web/index.php');//如果非手机端，执行跳转

 }