Function to apply callback to multiple keys defined by pattern.fastKeysCallback() uses redis SCAN with 100 elements

fastKeysCallback.php

$redis = new Redis();
$redis->pconnect('127.0.0.1', 33379);

/**
 * @param        $redis
 * @param string $mask
 * @param        $callback
 *
 * @return array|bool
 */
function fastKeysCallback($redis, $mask = '*', $callback) {
    if (!($redis instanceof Redis)) {
        return false;
    } elseif (!is_callable($callback)) {
        return false;
    }

    $redis->setOption(Redis::OPT_SCAN, Redis::SCAN_RETRY);

    $it = null;

    while ($arr_keys = $redis->scan($it, $mask, 100)) {
        foreach ($arr_keys as $str_key) {
            call_user_func($callback, $str_key);
        }

        usleep(10000);
    }

    return true;
}

$result = fastKeysCallback($redis, '/sets/*', function($key) use ($redis) {
    if ($redis->ttl($key) < 0) {
        $redis->expire($key, 86400);
    }
});

if ($result) {
    echo "Success\n";
} else {
    die('Error');
}