/* 
 * for detecting user browser
 */
function st_is_mobile(){
	$user_agent=$_SERVER["HTTP_USER_AGENT"];
	//echo $user_agent;
	$mobile_browsers=array(
		"mqqbrowser", //手机QQ浏览器
		"opera mobi", //手机opera
		"juc","iuc",//uc浏览器
		"fennec","ios","applewebKit/420","applewebkit/525","applewebkit/532","ipad","iphone","ipaq","ipod",
		"iemobile", "windows ce",//windows phone
		"240x320","480x640","acer","android","anywhereyougo.com","asus","audio","blackberry","blazer","coolpad" ,"dopod", "etouch", "hitachi","htc","huawei", "jbrowser", "lenovo","lg","lg-","lge-","lge", "mobi","moto","nokia","phone","samsung","sony","symbian","tablet","tianyu","wap","xda","xde","zte"
	);
	$is_mobile=false;//var_dump()
	foreach($mobile_browsers as $device){
		if(stristr($user_agent,$device)){
			$is_mobile=true;
			break;
		};
	};
	
	return $is_mobile;
}