PHP Function key()

Syntax

key ( $array );

Definition and Usage

The key() function returns the element key from the current internal pointer position.

Paramters

Parameter	Description
array	Required. Specifies an array

Return Value

This function returns FALSE on error= otherwise key.

Example

Try out following example:

<?php $array = array( 'fruit1' => 'apple', 'fruit2' => 'orange', 'fruit3' => 'grape', 'fruit4' => 'apple', 'fruit5' => 'apple'); while ($fruit_name = current($array)) { if ($fruit_name == 'apple') { echo key($array).'<br />'; } next($array); } ?>

This will produce following result:

fruit1 fruit4 fruit5