Online PHP editor | output for j3fMp

<?php function checkEmail($email) { $email = trim($email); if (filter_var($email, FILTER_VALIDATE_EMAIL) === false) { return false; } list($username, $domain) = explode("@", $email); if (getmxrr($domain, $mxHost)) { return true; } else { /* if (stripos(gethostbyaddr(gethostbyname($domain)), $domain) !== false) { return true; } */ if (checkdnsrr($domain, 'MX')) { return true; } // Is domain valid if (filter_var(gethostbyname($domain), FILTER_VALIDATE_IP)) { if (fsockopen($domain, 25, $errno, $errstr, 5)) { return true; } } } return false; } var_dump(checkEmail('kaidof@yahoo.com'));