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Final Class Yiisoft\NetworkUtilities\DnsHelper

All Classes | Methods
InheritanceYiisoft\NetworkUtilities\DnsHelper

DnsHelper contains static methods to work with DNS.

Public Methods

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Method Description Defined By
acceptsEmails() Checks email's domain availability. Yiisoft\NetworkUtilities\DnsHelper
existsA() Checks DNS A record availability. Yiisoft\NetworkUtilities\DnsHelper
existsMx() Checks DNS MX record availability. Yiisoft\NetworkUtilities\DnsHelper

Method Details

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acceptsEmails() public static method

Checks email's domain availability.

public static boolean acceptsEmails ( string $hostnameOrEmail )
$hostnameOrEmail string

Hostname without dot at end or an email.
return boolean

Whether email domain is available.

 

                public static function acceptsEmails(string $hostnameOrEmail): bool
{
    if (strpos($hostnameOrEmail, '@') !== false) {
        /**
         * @psalm-suppress PossiblyUndefinedArrayOffset In this case `explode()` always returns an array with 2 elements.
         */
        [, $hostnameOrEmail] = explode('@', $hostnameOrEmail, 2);
    }
    return self::existsMx($hostnameOrEmail) || self::existsA($hostnameOrEmail);
}
existsA() public static method

Checks DNS A record availability.

public static boolean existsA ( string $hostname )
$hostname string

Hostname without dot at end.
return boolean

Whether A records exists.

 

                public static function existsA(string $hostname): bool
{
    set_error_handler(static function (int $errorNumber, string $errorString) use ($hostname): bool {
        throw new RuntimeException(
            sprintf('Failed to get DNS record "%s". ', $hostname) . $errorString,
            $errorNumber
        );
    });
    /**
     * @var array $result We catch errors by `set_error_handler()` and throw exceptions if something goes wrong.
     * So `dns_get_record()` will always return an array.
     */
    $result = dns_get_record($hostname, DNS_A);
    restore_error_handler();
    return count($result) > 0;
}
existsMx() public static method

Checks DNS MX record availability.

public static boolean existsMx ( string $hostname )
$hostname string

Hostname without dot at end.
return boolean

Whether MX record exists.

 

                public static function existsMx(string $hostname): bool
{
    set_error_handler(static function (int $errorNumber, string $errorString) use ($hostname): bool {
        throw new RuntimeException(
            sprintf('Failed to get DNS record "%s". ', $hostname) . $errorString,
            $errorNumber
        );
    });
    $hostname = rtrim($hostname, '.') . '.';
    /**
     * @var array $result We catch errors by `set_error_handler()` and throw exceptions if something goes wrong.
     * So `dns_get_record()` will always return an array.
     */
    $result = dns_get_record($hostname, DNS_MX);
    restore_error_handler();
    return count($result) > 0;
}