/**
* 原子自减操作，可用于整形或浮点型列
*
* @param $key
* @param $column
* @param $decrby
* @return bool|int
*/
function decr($key, $column, $decrby = 1)
{
if ($this->_link) {
$rs = parent::incr($key, $column, $decrby);
if (false === $rs) {
return false;
}
if (false === $this->_driverSet($key, [$column => $rs])) {
# 重试
usleep(300);
$this->_driverSet($key, [$column => $rs]);
}
return $rs;
} else {
return parent::decr($key, $column, $decrby);
}
}