php判断手机浏览还是web浏览，并执行相应的动作

正好需要，在网上找了好久，记录一下

 1 function isMobile(){  
 2     $useragent=isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : '';  
 3     $useragent_commentsblock=preg_match('|(.*?)|',$useragent,$matches)>0?$matches[0]:'';        
 4     function CheckSubstrs($substrs,$text){  
 5         foreach($substrs as $substr)  
 6             if(false!==strpos($text,$substr)){  
 7                 return true;  
 8             }  
 9             return false;  
10     }
11     $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');
12     $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');  
13           
14     $found_mobile=CheckSubstrs($mobile_os_list,$useragent_commentsblock) ||  
15               CheckSubstrs($mobile_token_list,$useragent);  
16           
17     if ($found_mobile){  
18         return true;  
19     }else{  
20         return false;  
21     }  
22 }
23 if (isMobile()){
24     header('location: ./app/index.php');//如果为手机端，执行跳转
25 }
26 else{
27     header('location: ./web/index.php');//如果非手机端，执行跳转
28 }