Online PHP editor | rfc for fT4IB

@ 2013-10-24T14:08:54Z

<?php

function normalise_ip($address)
{
    if (preg_match('/(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})/', $address, $matches)) { // IPv4 address
        $num = 0;
        for ($i = 1; $i <= 4; $i++) {
            $octet = (int) $matches[$i];
            if ($octet > 255) {
                return false;
            }
            $num |= $octet << ((4 - $i) * 8);
        }
        return sprintf('0000000000000000ffff%04x', $num);
    } else if (preg_match('/\[?((?:[0-9a-f]{1,4}:|::)+[0-9a-f]{1,4})]?/i', strtolower($address), $matches)) { // IPv6 address
        $parts = explode(':', $matches[1]);
        $numParts = count($parts);
        if ($part[0] === '') {
            array_splice($parts, 0, 2, array_fill(0, 8 - ($numParts - 2), '0000'));
        } else if ($parts[$numParts - 1] === '') {
            array_splice($parts, $numParts - 2, 2, array_fill(0, 8 - ($numParts - 2), '0000'));
        } else {
            foreach ($parts as $i => $part) {
                if ($part === '') {
                    array_splice($parts, $i, 1, array_fill(0, 8 - ($numParts - 1), '0000'));
                }
            }
        }
        foreach ($parts as &$part) {
            $part = sprintf('%04s', $part);
        }
        return implode('', $parts);
    } else { // invalid
        return false;
    }
}

echo normalise_ip('192.168.0.1') . "\n";
echo normalise_ip('[::ffff:C0A8:0001]') . "\n";

Output for git.master, git.master_jit: 0000000000000000ffffc0a80001 Warning: Undefined variable $part in /in/fT4IB on line 18 Warning: Trying to access array offset on value of type null in /in/fT4IB on line 18 00000000000000000000000000000000ffffc0a80001
Output for rfc.property-hooks: 0000000000000000ffffc0a80001 Warning: Undefined variable $part in /in/fT4IB on line 18 Warning: Trying to access array offset on null in /in/fT4IB on line 18 00000000000000000000000000000000ffffc0a80001

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