<?php
function array_change_value_case($input, $ucase)
{
$case = $ucase;
$narray = array();
if (!is_array($input))
{
return $narray;
}
foreach ($input as $key => $value)
{
if (is_array($value))
{
$narray[$key] = array_change_value_case($value, $case);
 continue;
}
$narray[$key] = ($case == CASE_UPPER ? strtoupper($value) : strtolower($value));
}
return $narray;
}
$Color = array('A' => 'Blue', 'B' => 'Green', 'c' => 'Red');
echo 'Actual array 
';
print_r($Color);
echo '
Values are in lower case.
';
$myColor = array_change_value_case($Color,CASE_LOWER);
print_r($myColor);
echo '
Values are in upper case.
';
$myColor = array_change_value_case($Color,CASE_UPPER);
print_r($myColor);
?>