# trader_get_unstable_period

(PECL trader >= 0.2.2)

trader_get_unstable_period — Get unstable period

### 说明

trader_get_unstable_period ( int `$functionId` ) : int

Get unstable period factor for a particular function.

### 参数

`functionId`

  Function ID the factor to be read for. TRADER_FUNC_UNST_* series of constants should be used.

### 返回值

Returns the unstable period factor for the corresponding function.