php判斷終端是手機還是電腦訪問網站代碼

<?php function check_wap() {      if (isset($_SERVER['HTTP_VIA'])) return true;      if (isset($_SERVER['HTTP_X_NOKIA_CONNECTION_MODE'])) return true;      if (isset($_SERVER['HTTP_X_UP_CALLING_LINE_ID'])) return true;      if (strpos(strtoupper($_SERVER['HTTP_ACCEPT']),"VND.WAP.WML") > 0) {          // Check whether the browser/gateway says it accepts WML.          $br = "WML";      } else {          $browser = isset($_SERVER['HTTP_USER_AGENT']) ? trim($_SERVER['HTTP_USER_AGENT']) : '';          if(empty($browser)) return true;        $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,$browser)                     checkSubstrs($mobile_token_list,$browser); if($found_mobile)$br ="WML";else $br = "WWW";    }      if($br == "WML") {          return true;      } else {          return false;      }  }function checkSubstrs($list,$str){$flag = false;for($i=0;$i<count($list);$i++){if(strpos($str,$list[$i]) > 0){$flag = true;break;}}return $flag;}if(check_wap()){echo "wap";}else{echo "web";}?>