Detect Android Device using Javascript and PHP

Javascript
To detect android device using javascript use the following code,

var myUserAgent = navigator.userAgent.toLowerCase();
var isAndroidDevice = myUserAgent .indexOf("android") > -1 && myUserAgent .indexOf("mobile");
if(isAndroidDevice ) {
	// Do something for android device
	window.location = 'myandroid site url';
}

PHP
To detect android device using PHP use the following code,

$myUserAgent = strtolower($_SERVER['HTTP_USER_AGENT']);
if(stripos($myUserAgent ,'android') !== false) && stripos($ua,'mobile') !== false)
{
	header('Location: myandroid site url');
	exit();
}