php判断电脑访问或手机访问的方法

现在使用手机上网的人越来越多了，所以手机用户给网站带来流量也是非常可观的。但是对于像我这样的网站想让手机访问，那么体验度一定会很差，因为该站的css样式只适合用电脑浏览器访问。所以我就研究怎么用php去判断网页是电脑访问还是手机访问，然后再通过去加载不同的css来达到手机和电脑都可以正常的访问的效果。

<?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";

}

?>