PHP - Manual: MongoDB\BSON\Iterator::key
2025-02-27
(mongodb >=1.16.0)
MongoDB\BSON\Iterator::key — Returns the key of the current element
此函数没有参数。
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.
官方地址:https://www.php.net/manual/en/mongodb-bson-iterator.key.php