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key

(PHP 3, PHP 4 )

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().

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