MongoDB\BSON\Undefined::__toString

    (mongodb >=1.4.0)

    MongoDB\BSON\Undefined::__toString — Returns an empty string

    説明

    final public MongoDB\BSON\Undefined::__toString(): string

    パラメータ

    この関数にはパラメータはありません。

    戻り値

    Returns an empty string.

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