<?php
$user_agent = "Mozilla/5.0 (Linux; Android 4.4.2; SAMSUNG-GT-I9505 Build/KOT49H) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.96 Mobile Safari/537.36";
preg_match('/Android ([\d\.]+)/im', $user_agent, $matches); $version = $matches[1];
echo $version;
PD9waHAKCiR1c2VyX2FnZW50ID0gIk1vemlsbGEvNS4wIChMaW51eDsgQW5kcm9pZCA0LjQuMjsgU0FNU1VORy1HVC1JOTUwNSBCdWlsZC9LT1Q0OUgpIEFwcGxlV2ViS2l0LzUzNy4zNiAoS0hUTUwsIGxpa2UgR2Vja28pIENocm9tZS80MS4wLjIyNzIuOTYgTW9iaWxlIFNhZmFyaS81MzcuMzYiOwoKcHJlZ19tYXRjaCgnL0FuZHJvaWQgKFtcZFwuXSspL2ltJywgJHVzZXJfYWdlbnQsICRtYXRjaGVzKTsKJHZlcnNpb24gPSAkbWF0Y2hlc1sxXTsKCmVjaG8gJHZlcnNpb247