Wut?

export.php

function export_redis(RedisClient $redis, string $targetPath): array
{
    ensureDir(dirname($targetPath));

    $handle = fopen($targetPath, 'wb');
    if ($handle === false) {
        throw new RuntimeException("Unable to write Redis export: {$targetPath}");
    }

    $types = [
        Redis::REDIS_STRING => 'string',
        Redis::REDIS_SET => 'set',
        Redis::REDIS_LIST => 'list',
        Redis::REDIS_ZSET => 'zset',
        Redis::REDIS_HASH => 'hash',
    ];

    $keysWritten = 0;
    $it = null;
    do {
        $keys = $redis->scan($it, null, REDIS_SCAN_COUNT);
        if ($keys === false) {
            $keys = [];
        }

        foreach ($keys as $key) {
            $type = $redis->type($key);
            if ($type === Redis::REDIS_NOT_FOUND) {
                continue;
            }

            if (!isset($types[$type])) {
                throw new RuntimeException("Unsupported Redis type for key {$key}");
            }

            $entry = [
                'key_b64' => base64_encode((string) $key),
                'type' => $types[$type],
                'pttl' => (int) $redis->pttl($key),
            ];

            switch ($types[$type]) {
                case 'string':
                    $entry['value_b64'] = base64_encode((string) $redis->get($key));
                    break;
                case 'hash':
                    $items = [];
                    foreach ($redis->hGetAll($key) as $field => $value) {
                        $items[] = [base64_encode((string) $field), base64_encode((string) $value)];
                    }
                    $entry['items'] = $items;
                    break;
                case 'set':
                    $members = [];
                    foreach ($redis->sMembers($key) as $member) {
                        $members[] = base64_encode((string) $member);
                    }
                    $entry['members'] = $members;
                    break;
                case 'zset':
                    $members = [];
                    foreach ($redis->zRange($key, 0, -1, true) as $member => $score) {
                        $members[] = [base64_encode((string) $member), (float) $score];
                    }
                    $entry['members'] = $members;
                    break;
                case 'list':
                    $values = [];
                    foreach ($redis->lRange($key, 0, -1) as $value) {
                        $values[] = base64_encode((string) $value);
                    }
                    $entry['values'] = $values;
                    break;
            }

            $json = json_encode($entry, JSON_UNESCAPED_SLASHES | JSON_THROW_ON_ERROR);
            fwrite($handle, $json . "\n");
            $keysWritten++;
        }
    } while ($it !== 0);

    fclose($handle);

    return ['keys' => $keysWritten];
}