Online PHP editor | refs for lCtNi

<?php function getDomain() { return 'example.com'; } function getSubDomains() { return array('www.example.com'); } function register($domainKeys, $subdomains) { $domains = (array) getDomain(); if ($subdomains == null) { $domains = array_merge($domains, getSubdomains()); } else { $domains = array_merge($domains, $subdomains); } return $domains; } var_dump(register(null, []));