Detección de clientes móviles mediante javascript, PHP y .htaccess

Recopilo las forma de detectar navegadores de dispositivos móviles mediante distintas tecnologías:

Javascript

var ua = navigator.userAgent.toLowerCase();
var isAndroid = ua.indexOf("android") > -1; // && ua.indexOf("mobile");
var isiPhone = ua.indexOf("iphone") > -1;
var isiPod = ua.indexOf("ipod") > -1;
var isiPad = ua.indexOf("ipad") > -1;
// For use within iPad developer UIWebView
if(!isiPad) isiPad = /iPad/i.test(ua) || /iPhone OS 3_1_2/i.test(ua) || /iPhone OS 3_2_2/i.test(ua);
var isWPx = ua.indexOf("windows phone") > -1;

PHP

$ua = strtolower($_SERVER['HTTP_USER_AGENT']);
$isAndroid = stripos($ua, 'android') !== false; // && stripos($ua,'mobile') !== false
$isiPhone = stripos($ua, 'iphone') !== false;
$isiPod = stripos($ua, 'ipod') !== false;
$isiPad = stripos($ua, 'ipad') !== false;
$isWPx = stripos($ua, 'windows phone') !== false;

.htaccess

RewriteCond %{HTTP_USER_AGENT} ^.*Android.*$ RewriteRule ^(.*)$ http://android.site.com [R=301] RewriteCond %{HTTP_USER_AGENT} ^.*iPhone.*$ RewriteRule ^(.*)$ http://iphone.site.com [R=301] RewriteCond %{HTTP_USER_AGENT} ^.*iPod.*$ RewriteRule ^(.*)$ http://ipod.site.com [R=301] RewriteCond %{HTTP_USER_AGENT} ^.*iPad.*$ RewriteRule ^(.*)$ http://ipad.site.com [R=301]RewriteCond %{HTTP_USER_AGENT} ^.*Windows Phone.*$RewriteRule ^(.*)$ http://wpx.site.com [R=301]

HTML

<!--[if IEMobile]>
    Explorer mobile en Windows Phone 7
<![endif]-->
<![if !IEMobile]>
    Otros
<![endif]>