js,php实现用ua判断手机,ipad,pc浏览器访问网页不同尺寸页

js,php实现用ua判断手机,ipad,pc浏览器访问网页不同尺寸页

$ua = strtolower($_SERVER['HTTP_USER_AGENT']);
$uachar = "/(nokia|sony|ericsson|mot|samsung|sgh|lg|philips|panasonic|alcatel|lenovo|cldc|midp|mobile)/i";
if(($ua == '' || preg_match($uachar, $ua))&& !strpos(strtolower($_SERVER['REQUEST_URI']),'wap'))
{
	$is_iPad = (bool) strpos($_SERVER['HTTP_USER_AGENT'],'iPad');
	if($is_iPad){

跳转到ipad页面....

}else{ 

跳转到手机版页面....

}}else{
跳转到电脑版页面....
}