How to judge WeChat's built-in browser MicroMessenger

function is_weixin(){

    var ua = navigator.userAgent.toLowerCase();

    if(ua.match(/MicroMessenger/i)=="micromessenger") {

        return true;

     } else {

        return false;

    }

}

 

function is_weixin(){

    if ( strpos($_SERVER['HTTP_USER_AGENT'], 'MicroMessenger') !== false ) {

            return true;

    }    

    return false;

}