Construct a new Undefined (unused)

# MongoDB\BSON\Undefined::__construct

(mongodb >=1.4.0)

MongoDB\BSON\Undefined::__construct — Construct a new Undefined (unused)

### 说明

final private function MongoDB\BSON\Undefined::__construct()

MongoDB\BSON\Undefined objects are created through conversion from a deprecated BSON type and cannot be constructed directly.

### 参数

此函数没有参数。

### 参见

- » BSON Types

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