spl
PHP Manual

ArrayIterator::key

(PHP 5)

ArrayIterator::key — Return current array key

Description

mixed ArrayIterator::key ( void )

This function returns the current array key

Example#1 ArrayIterator::key() example

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

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

echo 
$iterator->key(); //key
?>


spl
PHP Manual