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<?php |
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declare(strict_types=1); |
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namespace Yiisoft\NetworkUtilities; |
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use RuntimeException; |
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/** |
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* DnsHelper contains static methods to work with DNS. |
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*/ |
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final class DnsHelper |
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{ |
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/** |
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* Checks DNS MX record availability. |
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* |
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* @param string $hostname Hostname without dot at end. |
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* |
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* @return bool Whether MX record exists. |
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*/ |
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public static function existsMx(string $hostname): bool |
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{ |
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set_error_handler(static function (int $errorNumber, string $errorString) use ($hostname): bool { |
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throw new RuntimeException( |
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sprintf('Failed to get DNS record "%s". ', $hostname) . $errorString, |
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$errorNumber |
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); |
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}); |
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$hostname = rtrim($hostname, '.') . '.'; |
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$result = dns_get_record($hostname, DNS_MX); |
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restore_error_handler(); |
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return count($result) > 0; |
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} |
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/** |
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* Checks DNS A record availability. |
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* |
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* @param string $hostname Hostname without dot at end. |
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* |
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* @return bool Whether A records exists. |
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*/ |
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public static function existsA(string $hostname): bool |
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{ |
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set_error_handler(static function (int $errorNumber, string $errorString) use ($hostname): bool { |
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throw new RuntimeException( |
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sprintf('Failed to get DNS record "%s". ', $hostname) . $errorString, |
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$errorNumber |
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); |
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}); |
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$result = dns_get_record($hostname, DNS_A); |
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restore_error_handler(); |
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return count($result) > 0; |
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} |
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/** |
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* Checks email's domain availability. |
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* |
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* @link https://tools.ietf.org/html/rfc5321#section-5 |
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* |
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* @param string $hostnameOrEmail Hostname without dot at end or an email. |
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* |
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* @return bool Whether email domain is available. |
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*/ |
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public static function acceptsEmails(string $hostnameOrEmail): bool |
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{ |
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if (strpos($hostnameOrEmail, '@') !== false) { |
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[, $hostnameOrEmail] = explode('@', $hostnameOrEmail, 2); |
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} |
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return self::existsMx($hostnameOrEmail) || self::existsA($hostnameOrEmail); |
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} |
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} |
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yiisoft /
network-utilities
