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MongoDB\BSON\Iterator::key

(mongodb >=1.16.0)

MongoDB\BSON\Iterator::keyReturns the key of the current element

说明

public MongoDB\BSON\Iterator::key(): string|int

参数

此函数没有参数。

返回值

Returns the key of the current element. When iterating a BSON document, the key will always be a string. When iterating a BSON array, the key will be an int.

错误/异常

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