all-in-one/php/domain-validator.php

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<?php
$domain = $_GET['domain'] ?? '';
if (strpos($domain, '.') === false) {
http_response_code(400);
} elseif (strpos($domain, '/') !== false) {
http_response_code(400);
} elseif (strpos($domain, ':') !== false) {
http_response_code(400);
} elseif (!filter_var($domain, FILTER_VALIDATE_DOMAIN, FILTER_FLAG_HOSTNAME)) {
http_response_code(400);
} elseif (filter_var($domain, FILTER_VALIDATE_IP)) {
http_response_code(400);
} else {
// Commented because logging is disabled as otherwise all attempts will be logged which spams the logs
// error_log($domain . ' was accepted as valid domain.');
http_response_code(200);
}