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<?php |
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3
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namespace Yiisoft\NetworkUtilities; |
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class DnsHelper |
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{ |
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/** |
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* @param string $hostname hostname without dot at end |
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* @return bool |
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* @link https://bugs.php.net/bug.php?id=78008 |
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*/ |
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2 |
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public static function existsMx(string $hostname): bool |
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{ |
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2 |
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$hostname = rtrim($hostname, '.') . '.'; |
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try { |
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2 |
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if (!@dns_check_record($hostname, 'MX')) { |
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return false; |
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} |
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$result = @dns_get_record($hostname, DNS_MX); |
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return $result !== false && count($result) > 0; |
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} catch (\Throwable $t) { |
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assert($t); |
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// eg. name servers are not found https://github.com/yiisoft/yii2/issues/17602 |
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} |
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return false; |
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} |
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/** |
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* @link https://bugs.php.net/bug.php?id=78008 |
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* @param string $hostname |
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* @return bool |
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*/ |
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public static function existsA(string $hostname): bool |
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{ |
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try { |
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if (!@dns_check_record($hostname, 'A')) { |
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return false; |
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} |
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$result = @dns_get_record($hostname, DNS_A); |
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return $result !== false && count($result) > 0; |
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} catch (\Throwable $t) { |
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assert($t); |
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// eg. name servers are not found https://github.com/yiisoft/yii2/issues/17602 |
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} |
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return false; |
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} |
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/** |
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* @link https://tools.ietf.org/html/rfc5321#section-5 |
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* @param string $hostnameOrEmail |
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* @return bool |
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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
