PHP判断PC端还是手机端

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 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;
             }else{
                 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())
 echo 'phone';
 else
 echo 'pc';
 ?>