hasCode testing

has_code.php

<?php

function hashCode($s)
{
    $h = 0;
    $len = strlen($s);
    for ($i = 0; $i < $len; $i++) {
        $h = (int) (63 * $h + ord($s[$i])) & -1;
        //$h = (int) (63 * $h + ord($s[$i])) & 0xffffffff
    }

    return $h;
}

class UUID
{
    public static function v3($namespace, $name)
    {
        if (!self::is_valid($namespace)) {
            return false;
        }

        // Get hexadecimal components of namespace
        $nhex = str_replace(['-', '{', '}'], '', $namespace);

        // Binary Value
        $nstr = '';

        // Convert Namespace UUID to bits
        for ($i = 0; $i < strlen($nhex); $i += 2) {
            $nstr .= chr(hexdec($nhex[$i].$nhex[$i + 1]));
        }

        // Calculate hash value
        $hash = md5($nstr.$name);

        return sprintf('%08s-%04s-%04x-%04x-%12s',

            // 32 bits for "time_low"
            substr($hash, 0, 8),

            // 16 bits for "time_mid"
            substr($hash, 8, 4),

            // 16 bits for "time_hi_and_version",
            // four most significant bits holds version number 3
            (hexdec(substr($hash, 12, 4)) & 0x0fff) | 0x3000,

            // 16 bits, 8 bits for "clk_seq_hi_res",
            // 8 bits for "clk_seq_low",
            // two most significant bits holds zero and one for variant DCE1.1
            (hexdec(substr($hash, 16, 4)) & 0x3fff) | 0x8000,

            // 48 bits for "node"
            substr($hash, 20, 12)
        );
    }

    public static function v4()
    {
        return sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x',

            // 32 bits for "time_low"
            mt_rand(0, 0xffff), mt_rand(0, 0xffff),

            // 16 bits for "time_mid"
            mt_rand(0, 0xffff),

            // 16 bits for "time_hi_and_version",
            // four most significant bits holds version number 4
            mt_rand(0, 0x0fff) | 0x4000,

            // 16 bits, 8 bits for "clk_seq_hi_res",
            // 8 bits for "clk_seq_low",
            // two most significant bits holds zero and one for variant DCE1.1
            mt_rand(0, 0x3fff) | 0x8000,

            // 48 bits for "node"
            mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff)
        );
    }

    public static function v5($namespace, $name)
    {
        if (!self::is_valid($namespace)) {
            return false;
        }

        // Get hexadecimal components of namespace
        $nhex = str_replace(['-', '{', '}'], '', $namespace);

        // Binary Value
        $nstr = '';

        // Convert Namespace UUID to bits
        for ($i = 0; $i < strlen($nhex); $i += 2) {
            $nstr .= chr(hexdec($nhex[$i].$nhex[$i + 1]));
        }

        // Calculate hash value
        $hash = sha1($nstr.$name);

        return sprintf('%08s-%04s-%04x-%04x-%12s',

            // 32 bits for "time_low"
            substr($hash, 0, 8),

            // 16 bits for "time_mid"
            substr($hash, 8, 4),

            // 16 bits for "time_hi_and_version",
            // four most significant bits holds version number 5
            (hexdec(substr($hash, 12, 4)) & 0x0fff) | 0x5000,

            // 16 bits, 8 bits for "clk_seq_hi_res",
            // 8 bits for "clk_seq_low",
            // two most significant bits holds zero and one for variant DCE1.1
            (hexdec(substr($hash, 16, 4)) & 0x3fff) | 0x8000,

            // 48 bits for "node"
            substr($hash, 20, 12)
        );
    }

    public static function is_valid($uuid)
    {
        return preg_match('/^\{?[0-9a-f]{8}\-?[0-9a-f]{4}\-?[0-9a-f]{4}\-?'.
                '[0-9a-f]{4}\-?[0-9a-f]{12}\}?$/i', $uuid) === 1;
    }
}

$results = [];
for ($i = 1; $i < 300000; $i++) {
    if ($i % 50000 === 0) {
        echo PHP_EOL."Iterations passed: {$i}".PHP_EOL.PHP_EOL;
    }

    $uuid = UUID::v4();
    $hashCode = hashCode($uuid);

    if (isset($results[$uuid])) {
        echo 'Same UUID already exists:'.PHP_EOL;
        echo "\tOld: {$uuid}:{$results[$uuid]}".PHP_EOL;
        echo "\tNEW: {$uuid}:$hashCode".PHP_EOL;
    }

    if (in_array($hashCode, $results, false)) {
        $oldUuid = array_search($hashCode, $results, false);
        echo 'Same HashCode already exists:'.PHP_EOL;
        echo "\tOld: {$oldUuid}:{$hashCode}".PHP_EOL;
        echo "\tNEW: {$uuid}:$hashCode".PHP_EOL;

    }

    $results[$uuid] = $hashCode;
}