MongoDB\BSON\Undefined::__toString

(mongodb >=1.4.0)

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

说明

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

参数

此函数没有参数。

返回值

Returns an empty string.

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备份地址：http://www.lvesu.com/blog/php/mongodb-bson-undefined.tostring.php