New IPv6 related functions in PHP8.1

PHP8.1’s new IPv6 related functions

With the development of the Internet, IPv6 is widely used as the next generation Internet protocol. In order to adapt to the popularity of IPv6, PHP8.1 has added some IPv6-related functions in the new version so that developers can handle IPv6 addresses more conveniently.

1. inet_pton() function

inet_pton() function is used to convert IPv4 or IPv6 addresses into binary strings. Before PHP8.1, only IPv4 address conversion was supported, and for IPv6 addresses, you needed to use the inet_pton() extension function. In PHP8.1, the inet_pton() function has built-in support for IPv6 addresses.

The following is a sample code:

$ipv4Address = "192.168.0.1";
$ipv6Address = "2001:0db8:85a3:0000:0000:8a2e:0370:7334";

$binaryIpv4 = inet_pton($ipv4Address);
$binaryIpv6 = inet_pton($ipv6Address);

echo bin2hex($binaryIpv4) . "
";
echo bin2hex($binaryIpv6) . "
";

The output result of the above code is:

c0a80001
20010db885a3000000008a2e03707334

2. inet_ntop() function

inet_ntop() function and inet_pton () function corresponds to converting a binary string into an IPv4 or IPv6 address.

The following is a sample code:

$binaryIpv4 = hex2bin("c0a80001");
$binaryIpv6 = hex2bin("20010db885a3000000008a2e03707334");

$ipv4Address = inet_ntop($binaryIpv4);
$ipv6Address = inet_ntop($binaryIpv6);

echo $ipv4Address . "
";
echo $ipv6Address . "
";

The output result of the above code is:

192.168.0.1
2001:db8:85a3::8a2e:370:7334

3. ipv6_checkdnsrr() function

ipv6_checkdnsrr() function is used Checks the DNS record for the specified hostname for an IPv6 address. In versions prior to PHP 8.1, only DNS records for IPv4 addresses can be checked, and for IPv6 addresses, the extension function of ipv6_checkdnsrr() needs to be used. In PHP8.1, the ipv6_checkdnsrr() function has built-in support for IPv6 addresses.

The following is a sample code:

$hostname = "www.example.com";

if (ipv6_checkdnsrr($hostname, "AAAA")) {
    echo "IPv6 DNS record exists for " . $hostname . "
";
} else {
    echo "IPv6 DNS record does not exist for " . $hostname . "
";
}

The above code will return the corresponding results based on the specified host name.

To sum up, the new IPv6-related functions in PHP8.1 provide developers with a more convenient way to handle IPv6 addresses. Developers can convert IPv4 or IPv6 addresses into binary strings through the inet_pton() function, or convert binary strings into IPv4 or IPv6 addresses through the inet_ntop() function. In addition, the ipv6_checkdnsrr() function can be used to check whether an IPv6 address exists in the DNS record of the specified host name.

If you are developing an application and need to deal with IPv6 addresses, these new functions in PHP8.1 will be very useful to you. I hope this article can help you better understand and use these functions.

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