3v4l.org

run code in 150+ php & hhvm versions
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<?php $site = "http://hollandshielding.com/"; $url = parse_url($site); $hasSubdomain = preg_match('/(\w)\.(\w)\.(\w)/', $url['host']); var_dump($subdomain);
Output for 5.0.4 - 5.6.28, 7.0.0 - 7.1.0
Notice: Undefined variable: subdomain in /in/JGM5C on line 7 NULL
Output for hhvm-3.12.0
Notice: Undefined variable: subdomain in /in/JGM5C on line -1 NULL
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: subdomain in /in/JGM5C on line 7 NULL