代码如下:

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;$i  if(strpos($str,$list[$i]) > 0){
   $flag = true;
   break;
  }
 }
 return $flag;
}

if(check_wap()){
 echo "wap";
}else{
 echo "web";
}

?>