# key

(PHP 4, PHP 5)

key — Fetch a key from an associative array

### Description

mixed key ( array `&$array` )

key() returns the index element of the current array position.

Example#1 key() example

`<?php
$array = array(
'fruit1' => 'apple',
'fruit2' => 'orange',
'fruit3' => 'grape',
'fruit4' => 'apple',
'fruit5' => 'apple');
// this cycle echoes all associative array
// key where value equals "apple"
while ($fruit_name = current($array)) {
if ($fruit_name == 'apple') {
echo key($array).'<br />';
}
next($array);
}
?>`

See also current() and next().