PHP Manual
MongoDB\BSON\Undefined
Returns an empty string

MongoDB\BSON\Undefined::__toString

(mongodb >=1.4.0)

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

说明

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

参数

此函数没有参数。

返回值

Returns an empty string.

参见

» BSON Types

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