inet_pton

Description

string inet_pton ( string address )

This function converts a human readable IPv4 or IPv6 address (if PHP was built with IPv6 support enabled) into an address family appropriate 32bit or 128bit binary structure.

例子 1. inet_pton() Example


<?php
$in_addr = inet_pton('127.0.0.1');

$in6_addr = inet_pton('::1');

?>

注: 本函数未在 Windows 平台下实现。

See also ip2long(), inet_ntop(), and long2ip().

add a note User Contributed Notes

me at diogoresende dot net
17-May-2006 05:34


If you want to use the above function you should test for ':' character before '.'. Meaning, you should check if it's an ipv6 address before checking for ipv4.

Why? IPv6 allows this type of notation:



::127.0.0.1



If you check for '.' character you will think this is an ipv4 address and it will fail.

djmaze(AT)dragonflycms(.)org
14-Dec-2005 04:01


If you need the functionality but your PHP version doesn't have the functionality (like on windows) the following might help



<?php

function inet_pton($ip)

{

    # ipv4

    if (strpos($ip, '.') !== FALSE) {

        $ip = pack('N',ip2long($ip));

    }

    # ipv6

    elseif (strpos($ip, ':') !== FALSE) {

        $ip = explode(':', $ip);

        $res = str_pad('', (4*(8-count($ip))), '0000', STR_PAD_LEFT);

        foreach ($ip as $seg) {

            $res .= str_pad($seg, 4, '0', STR_PAD_LEFT);

        }

        $ip = pack('H'.strlen($res), $res);

    }

    return $ip;

}

?>

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