How to determine WeChat's built-in browser (implemented through User Agent)_javascript skills

When developing WeChat public accounts, a large part of it is the development of microsites. We need to know that the current browser is WeChat’s built-in browser, so how to judge?

User Agent of WeChat’s built-in browser

How to determine the WeChat built-in browser, you first need to obtain the User Agent of the WeChat built-in browser. After testing the WeChat browser on the iPhone, its User Agent is:

Mozilla/5.0 (iPhone; CPU iPhone OS 6_1_3 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Mobile/10B329 MicroMessenger/5.0.1

So by identifying the keyword MicroMessenger, you can determine whether WeChat has a built-in browser.

Judge via JavaScript

function is_weixin(){
var ua = navigator.userAgent.toLowerCase();
if(ua.match(/MicroMessenger/i)=="micromessenger") {
return true;
} else {
return false;
}
}

Judge via PHP

function is_weixin(){ 
if ( strpos($_SERVER['HTTP_USER_AGENT'], 'MicroMessenger') !== false ) {
return true;
} 
return false;
}