Set compatibility mode

# trader_set_compat

(PECL trader >= 0.2.2)

trader_set_compat — Set compatibility mode

### 说明

function trader_set_compat(int `$compatId`): void

Set compatibility mode which will affect the way calculations are done by all the extension functions.

### 参数

`compatId`

  Compatibility Id. TRADER_COMPATIBILITY_* series of constants should be used.

### 返回值

没有返回值。

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