PHP: ArrayIterator::key - Manual

(PHP 5, PHP 7, PHP 8)

ArrayIterator::key — Return current array key

Description

public function ArrayIterator::key(): string|int|null

This function returns the current array key

Parameters

This function has no parameters.

Return Values

The current array key.

Examples

<?php
$array = array('key' => 'value');

$arrayobject = new ArrayObject($array);
$iterator = $arrayobject->getIterator();

echo $iterator->key(); //key
?>