I Have this user agent :
User Agent : Mozilla/5.0 (Linux; Android 7.1.2; Redmi 4A Build/N2G47H; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.158 Mobile Safari/537.36 FreeDDNS-APP
Now, how to just show "FreeDDNS-APP" with php ?