PHP判断PC或者手机

$ua = strtolower($_SERVER['HTTP_USER_AGENT']);

$uachar = "/(nokia|sony|ericsson|mot|samsung|sgh|lg|philips|panasonic|alcatel|lenovo|cldc|midp|mobile|ipad|iphone|android)/i";
if(preg_match($uachar, $ua))
{
if(!empty($_SERVER['REQUEST_URI'])){//手机访问，跳转至手机版对应的页面
$localurl = $URL.$_SERVER['REQUEST_URI'];
header("Location: $localurl");
}else{
header("Location: $URL"); //PC
}
}