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Fetch a key from an array

Array Functions

key

(PHP 4, PHP 5)

key — Fetch a key from an array

Description

mixed key ( array &$array )

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

Parameters

array: The array.

Return Values

Returns the index.

Examples

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);
}
?>

The above example will output:

  fruit1<br /> fruit4<br /> fruit5<br />

See Also

Array Functions