PHP Manual
Iterator
Return the key of the current element

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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