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Dieses Dokument verwendet PHP-Handbuch für chinesische Websites Freigeben
(PECL mongo >=0.9.0)
MongoCursor::key — Returns the current result's _id, or its index within the result set
此函数没有参数。
The current result's _id as a string. If the result has no _id, its numeric index within the result set will be returned as an integer.