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');//如果為手機端，執行跳轉}else{  header('location: ./web/index.php');//如果非手機端，執行跳轉}