redis ERR value is not an integer or out of range

$fee = 0.01;
$redis->incrby('num',$fee);
//ERR value is not an integer or out of range incrby不能用浮点数，除了*100转换还有办法吗?

回复内容：

$fee = 0.01;
$redis->incrby('num',$fee);
//ERR value is not an integer or out of range incrby不能用浮点数，除了*100转换还有办法吗?

不是很清楚了吗.第二个参数要是int类型的