Returns the previous description for the server

# MongoDB\Driver\Monitoring\ServerChangedEvent::getPreviousDescription

(mongodb >=1.13.0)

MongoDB\Driver\Monitoring\ServerChangedEvent::getPreviousDescription — Returns the previous description for the server

### 说明

final public function MongoDB\Driver\Monitoring\ServerChangedEvent::getPreviousDescription(): MongoDB\Driver\ServerDescription

### 参数

此函数没有参数。

### 返回值

Returns the previous MongoDB\Driver\ServerDescription for the server.

### 错误／异常

- Throws MongoDB\Driver\Exception\InvalidArgumentException on argument parsing errors.

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