MongoDB\BSON\Undefined::__construct
(mongodb >=1.4.0)
MongoDB\BSON\Undefined::__construct — Construct a new Undefined (unused)
说明
final private 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
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