Change all keys in an array to lowercase: in PHP

Description

The following code shows how to change all keys in an array to lowercase:.

Example

/*from w ww .  ja va2 s . c o  m*/
<?php
    $age=array("XML"=>"35","HTML"=>"37","CSS"=>"43");
    print_r(array_change_key_case($age,CASE_LOWER));
?>

The code above generates the following result.