Iterator::key
(PHP 5, PHP 7, PHP 8)
Iterator::key — Return the key of the current element
Description
public Iterator::key(): mixed
Returns the key of the current element.
Parameters
This function has no parameters.
Return Values
Returns scalar on success, or null on failure.
Errors/Exceptions
Issues E_NOTICE on failure.
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Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/iterator.key.php
