php判断终端是手机还是电脑访问网站的思路及代码

<?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";
}
?>

<?php
header("Content-type:text/html;charset=utf-8");
function is_mobile(){
$user_agent = $_SERVER[HTTP_USER_AGENT];
$mobile_agents = Array("240x320","acer","acoon","acs-","abacho","ahong","airness","alcatel","amoi","android","anywhereyougo.com","applewebkit/525","applewebkit/532","asus","audio","au-mic","avantogo","becker","benq","bilbo","bird","blackberry","blazer","bleu","cdm-","compal","coolpad","danger","dbtel","dopod","elaine","eric","etouch","fly ","fly_","fly-","go.web","goodaccess","gradiente","grundig","haier","hedy","hitachi","htc","huawei","hutchison","inno","ipad","ipaq","ipod","jbrowser","kddi","kgt","kwc","lenovo","lg ","lg2","lg3","lg4","lg5","lg7","lg8","lg9","lg-","lge-","lge9","longcos","maemo","mercator","meridian","micromax","midp","mini","mitsu","mmm","mmp","mobi","mot-","moto","nec-","netfront","newgen","nexian","nf-browser","nintendo","nitro","nokia","nook","novarra","obigo","palm","panasonic","pantech","philips","phone","pg-","playstation","pocket","pt-","qc-","qtek","rover","sagem","sama","samu","sanyo","samsung","sch-","scooter","sec-","sendo","sgh-","sharp","siemens","sie-","softbank","sony","spice","sprint","spv","symbian","tablet","talkabout","tcl-","teleca","telit","tianyu","tim-","toshiba","tsm","up.browser","utec","utstar","verykool","virgin","vk-","voda","voxtel","vx","wap","wellco","wig browser","wii","windows ce","wireless","xda","xde","zte");
$is_mobile = false;
foreach ($mobile_agents as $device) {
if (stristr($user_agent, $device)) {
$is_mobile = true;
break;
}
}
return $is_mobile;
}
if(is_mobile()){
echo "手机";
}else{
echo "电脑";
}