Online PHP editor | rfc for vcVXG

@ 2013-10-24T14:13:50Z

<?php

function normalise_ip($address)
{
    $address = trim(strtolower($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('00000000000000000000ffff%04x', $num);
    } else if (preg_match('/^\[?((?:[0-9a-f]{1,4}:?|::)+)]?$/i', $address, $matches)) { // IPv6 address
        $parts = explode(':', $matches[1]);
        $numParts = count($parts);
        var_dump($parts, $parts[$numParts - 1]);
        if ($parts[0] === '') {
            array_splice($parts, 0, 2, array_fill(0, 8 - ($numParts - 2), '0000'));
        } else if ($parts[$numParts - 1] === '') {
            echo "end\n";
            array_splice($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";
echo normalise_ip('::ffff:C0A8:1') . "\n";
echo normalise_ip('[::ffff:C0A8:0001]') . "\n";
echo normalise_ip('[C0A8:0001::]') . "\n";

Output for git.master, git.master_jit, rfc.property-hooks: 00000000000000000000ffffc0a80001 array(5) { [0]=> string(0) "" [1]=> string(0) "" [2]=> string(4) "ffff" [3]=> string(4) "c0a8" [4]=> string(4) "0001" } string(4) "0001" 00000000000000000000ffffc0a80001 array(5) { [0]=> string(0) "" [1]=> string(0) "" [2]=> string(4) "ffff" [3]=> string(4) "c0a8" [4]=> string(1) "1" } string(1) "1" 00000000000000000000ffffc0a80001 array(5) { [0]=> string(0) "" [1]=> string(0) "" [2]=> string(4) "ffff" [3]=> string(4) "c0a8" [4]=> string(4) "0001" } string(4) "0001" 00000000000000000000ffffc0a80001 array(4) { [0]=> string(4) "c0a8" [1]=> string(4) "0001" [2]=> string(0) "" [3]=> string(0) "" } string(0) "" end c0a80001000000000000000000000000

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