MongoDB\BSON\Iterator::key

(mongodb >=1.16.0)

MongoDB\BSON\Iterator::key — Returns the key of the current element

Description

Parameters

This function has no parameters.

Return Values

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 .

Errors/Exceptions

• Throws MongoDB\Driver\Exception\InvalidArgumentException on argument parsing errors.
• Throws MongoDB\Driver\Exception\LogicException if the iterator is not valid.

See Also

• Iterator::key() - Return the key of the current element