如何判断 iPad 的浏览器

Mozilla/5.0 (iPad; U; CPU OS 3_2 like Mac OS X; en-us) AppleWebKit/531.21.10 (KHTML, like Gecko) Version/4.0.4 Mobile/7B334b Safari/531.21.10

function is_iPad(){
	var ua = navigator.userAgent.toLowerCase();
	if(ua.match(/iPad/i)=="ipad") {
		return true;
 	} else {
		return false;
	}
}

$is_iPad = (bool) strpos($_SERVER['HTTP_USER_AGENT'],'iPad');

RewriteCond %{HTTP_USER_AGENT} ^.*iPad.*$
RewriteRule ^(.*)$ http://ipad.fairyfish.net [R=301]