Php convert ipv6 to number

Question

In Ipv4 we can use ip2long to convert it to number,

How to convert ipv6 compressed to number in PHP?

I tried inet_pton and it\'s not working.

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Answer 1

A version of the answer by boen_robot which avoids the overflow issue, using BC Math if available.

function ipv62numeric($ip)
{
    $str = '';
    foreach (unpack('C*', inet_pton($ip)) as $byte) {
        $str .= str_pad(decbin($byte), 8, '0', STR_PAD_LEFT);
    }
    $str = ltrim($str, '0');
    if (function_exists('bcadd')) {
        $numeric = 0;
        for ($i = 0; $i < strlen($str); $i++) {
            $right  = base_convert($str[$i], 2, 10);
            $numeric = bcadd(bcmul($numeric, 2), $right);
        }
        $str = $numeric;
    } else {
        $str = base_convert($str, 2, 10);
    }

    return $str;
}

Example:

echo ipv62numeric('2001:11ff:ffff::f');

Will return "42540853245347499564798372846648688655" as a string, which is the correct answer.