PHP和JAVASCRIPT判断访客终端是电脑还是手机

<?php //判断手机参数
function sywap(){ 
$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","iphone","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"); 
$sywap = false;foreach($mobile_agents as $device){if(stristr($user_agent, $device)) {$sywap = true;break;}}return $sywap;}?>

<?php if(sywap()){?>是手机端显示参数
<?php }else{?>不是手机端显示参数
<?php }?>

<?php if(sywap()){header('Location:http://www.shuyong.net/wap/');?>
<?php }else{header('Location:http://www.shuyong.net/');//不是手机访问跳转到电脑版?>
<?php }?>