Redis 使用 Eval 多个键值自增操作示例

在PHP上使用Redis 给多个键值进行自增，示例如下：

$set['money'] = $this->redis->hIncrByFloat($key, $hour .'_money', $data['money']);
$set['ip'] = $this->redis->hIncrBy($key, $hour .'_ip', $data['ip']);
$set['uv'] = $this->redis->hIncrBy($key, $hour .'_uv', $data['uv']);
$set['pv'] = $this->redis->hIncrBy($key, $hour .'_pv', $data['pv']);
$this->redis->hSet($key, $hour, array($data['money'], $data['ip'], $data['uv'], $data['pv']));

如果这样写可能需要请求五次，可以通过 Eval 方法来一次完成，大大提高效率

$script  = 'local money = redis.call("hIncrByFloat", KEYS[1], ARGV[1], ARGV[2]);';
$script .= 'local ip = redis.call("hIncrBy", KEYS[1], ARGV[3], ARGV[4]);';
$script .= 'local uv = redis.call("hIncrBy", KEYS[1], ARGV[5], ARGV[6]);';
$script .= 'local pv = redis.call("hIncrBy", KEYS[1], ARGV[7], ARGV[8]);';
$script .= 'local val = money ..",".. ip ..",".. uv ..",".. pv;';
$script .= 'redis.call("hSet", KEYS[1], ARGV[2], val);';
$script .= 'return val;';
$result = $this->redis->evaluate($script, [$key, $hour, $hour .'_money', $data['money'], $hour .'_ip', $data['ip'], $hour .'_uv', $data['uv'], $hour .'_pv', $data['pv']], 2);
var_dump($result);

Redis 用的 Lua 语法，我也不熟悉，这个字符串拼接方式也很特别的是两个点号 “..”

money ..",".. ip ..",".. uv ..",".. pv
拼接后
0.01,1,2,3