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

Use:

$ip  = 'fe80:0:0:0:202:b3ff:fe1e:8329';
$dec = ip2long_v6($ip);
$ip2 = long2ip_v6($dec);

// $ip  = fe80:0:0:0:202:b3ff:fe1e:8329
// $dec = 338288524927261089654163772891438416681
// $ip2 = fe80::202:b3ff:fe1e:8329

Functions:

With enabled GMP or BCMATH extension.

function ip2long_v6($ip) {
    $ip_n = inet_pton($ip);
    $bin = '';
    for ($bit = strlen($ip_n) - 1; $bit >= 0; $bit--) {
        $bin = sprintf('%08b', ord($ip_n[$bit])) . $bin;
    }

    if (function_exists('gmp_init')) {
        return gmp_strval(gmp_init($bin, 2), 10);
    } elseif (function_exists('bcadd')) {
        $dec = '0';
        for ($i = 0; $i < strlen($bin); $i++) {
            $dec = bcmul($dec, '2', 0);
            $dec = bcadd($dec, $bin[$i], 0);
        }
        return $dec;
    } else {
        trigger_error('GMP or BCMATH extension not installed!', E_USER_ERROR);
    }
}

function long2ip_v6($dec) {
    if (function_exists('gmp_init')) {
        $bin = gmp_strval(gmp_init($dec, 10), 2);
    } elseif (function_exists('bcadd')) {
        $bin = '';
        do {
            $bin = bcmod($dec, '2') . $bin;
            $dec = bcdiv($dec, '2', 0);
        } while (bccomp($dec, '0'));
    } else {
        trigger_error('GMP or BCMATH extension not installed!', E_USER_ERROR);
    }

    $bin = str_pad($bin, 128, '0', STR_PAD_LEFT);
    $ip = array();
    for ($bit = 0; $bit <= 7; $bit++) {
        $bin_part = substr($bin, $bit * 16, 16);
        $ip[] = dechex(bindec($bin_part));
    }
    $ip = implode(':', $ip);
    return inet_ntop(inet_pton($ip));
}

demo