Mobile Detection with Optional Zepto / jQuery include

gistfile1.php

<?php
	$deviceClass = "";
	if (ereg('iPhone',$_SERVER['HTTP_USER_AGENT']) || ereg('iPod',$_SERVER['HTTP_USER_AGENT'])) {
		$deviceClass = "ui-iphone";
	} else if (ereg('iPad',$_SERVER['HTTP_USER_AGENT'])) {
		$deviceClass = "ui-ipad";
	} else if (ereg('Android',$_SERVER['HTTP_USER_AGENT']) && ereg('Mobile Safari',$_SERVER['HTTP_USER_AGENT'])) {
		$deviceClass = "ui-android";
	};
?>


<?php
	if($deviceClass == "ui-iphone" || $deviceClass == "ui-ipad" || $deviceClass == "ui-android") {
?>
	<script src="js/lib/zepto.min.js"></script>
<?php			
	} else {
?>
	<script src="js/lib/jquery-min.js"></script>
<?php
	}
?>


<!-- Script Module usage example -->

<script>

;(function($, doc, undefined){

// $ will be assigned to Zepto or jQuery depending on PHP
// for desktop (jQuery) or mobile (Zepto) support re-using the same code

}(window.Zepto || window.jQuery, document));

</script>