PHP Array Exercises : Change the array values to upper or lower case

<?php
// Define a function named 'array_change_value_case' that changes the case of array values
function array_change_value_case($input, $ucase)
{
    // Store the desired case (CASE_UPPER or CASE_LOWER) in the variable $case
    $case = $ucase;

    // Initialize an empty array to store the new values
    $narray = array();

    // Check if the input is not an array
    if (!is_array($input))
    {
        // If not an array, return an empty array
        return $narray;
    }

    // Iterate through the input array
    foreach ($input as $key => $value)
    {
        // Check if the current value is an array
        if (is_array($value))
        {
            // If it's an array, recursively call the function on the sub-array
            $narray[$key] = array_change_value_case($value, $case);
            // Continue to the next iteration
            continue;
        }

        // Change the case of the current value based on the specified case
        $narray[$key] = ($case == CASE_UPPER ? strtoupper($value) : strtolower($value));
    }

    // Return the new array with changed case values
    return $narray;
}

// Define an associative array $Color with keys 'A', 'B', and 'c'
$Color = array('A' => 'Blue', 'B' => 'Green', 'c' => 'Red');

// Output a message indicating the start of the section for the actual array
echo 'Actual array ';

// Display the original array $Color
print_r($Color);

// Output a message indicating that values are in lower case
echo 'Values are in lower case.';

// Call the array_change_value_case function with CASE_LOWER and display the result
$myColor = array_change_value_case($Color, CASE_LOWER);
print_r($myColor);

// Output a message indicating that values are in upper case
echo 'Values are in upper case.';

// Call the array_change_value_case function with CASE_UPPER and display the result
$myColor = array_change_value_case($Color, CASE_UPPER);
print_r($myColor);
?>