3v4l.org

run code in 300+ PHP versions simultaneously
<?php $host = parse_url('http://www.waxoyl.be/test.html'); preg_match('/(.*?)((\.co)?.[a-z]{2,4})$/i', $host['host'], $m); $ext = isset($m[2]) ? $m[2]: ''; var_dump($ext);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.35, 5.6.0 - 5.6.21, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
string(3) ".be"
preferences:
191.96 ms | 406 KiB | 359 Q