- preg_match: documentation ( source)
- print_r: documentation ( source)
<?php
$a = 'Mozilla/5.0 (Linux; Android 4.0.4; Galaxy Nexus Build/IMM76B) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.133 Mobile Safari/535.19';
$pattern = "/Android (\d).(\d).(\d)/";
preg_match($pattern, $a, $matches);
print_r($matches);