MongoDB\BSON\Iterator::key
(mongodb >=1.16.0)
MongoDB\BSON\Iterator::key — Returns the key of the current element
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
- Throws MongoDB\Driver\Exception\InvalidArgumentException on argument parsing errors.
- Throws MongoDB\Driver\Exception\LogicException if the iterator is not valid.
参见
- Iterator::key() - 返回当前元素的键
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