PHP Version 7.2.9
Redis Version 4.2.0RC1

扩展后调用失败
致命错误: Call to a member function pfadd() on null
$redis = Cache::store('redis')->handler();
$redis->pfadd('name', 1);

总算找到解决了，使用原生类
use Redis;

$redis = new Redis();
$redis->connect('127.0.0.1',6379);
$redis->pfadd('xx', [1]);
$redis->pfcount('xx');