使用PHP导出Redis数据到另一个Redis中的代码

从某个 redis db 导出数据到另一个 redis db 的php脚本：

$from = '127.0.0.1:6200/6';
$to   = '127.0.0.1:6200/8';

$from_redis = redis_init($from);
$to_redis   = redis_init($to);

$keys  = $from_redis->keys('*');
$count = 0;
$total = count($keys);
foreach($keys as $key){
    if(++$count % 100 == 1){
        echo "$count/$total\n";
    }
    $type = $from_redis->type($key);
    switch($type){
        case redis::redis_string:
            $val = $from_redis->get($key);
            $to_redis->set($key, $val);
            break;
        case redis::redis_list:
            $list = $from_redis->lrange($key, 0, -1);
            foreach($list as $val){
                $to_redis->rpush($key, $val);
            }
            break;
        case redis::redis_hash:
            $hash = $from_redis->hgetall($key);
            $to_redis->hmset($key, $hash);
            break;
        case redis::redis_zset:
            $zset = $from_redis->zrange($key, 0, -1, true);
            foreach($zset as $val=>$score){
                $to_redis->zadd($key, $score, $val);
            }
            break;
    }
}

function redis_init($conf){
    $redis = new redis();
    preg_match('/^([^:]+)(:[0-9]+)?\\/(.+)?/', $conf, $ms);
    $host = $ms[1];
    $port = trim($ms[2], ':');
    $db = $ms[3];
    $redis->connect($host, $port);
    $redis->select($db);
    return $redis;
}