Online PHP editor | output for TvBU7

<?php function validateEmail($email = "") { if (!$email) { return false; } if (filter_var($email, FILTER_VALIDATE_EMAIL)) { $domain = substr(strrchr($email, "@"), 1); echo $domain; var_dump(checkdnsrr($domain, 'MX')); if (!checkdnsrr($domain, 'MX')) { echo 222; // domain is not valid return false; } else if (preg_match('/successfulmatch\.com$/i', $domain) || preg_match('/88vip\.site$/i', $domain)) { return true; } } else { return false; } } //var_dump(validateEmail("luxury01@gmail.com")); var_dump(validateEmail("samsheng133@gmail.com"));