array_walk_recursive

<?

function myfunction(&$value, $key)
{
    return $value .= "s";
}

$array = array("a" => array("orange", "lime"), "b" => "banana", "c" => "apple", "d" => "lemon");
$callback = "myfunction";

array_walk_recursive($array, $callback);

print_r($array);

?>

Array
(
    [a] => Array
        (
            [0] => oranges
            [1] => limes
        )

    [b] => bananas
    [c] => apples
    [d] => lemons
)

<?

function myfunction(&$value, $key, $arg)
{
    return $value = "$arg: $value" . "s";
}

$array = array("a" => array("orange", "lime"), "b" => "banana", "c" => "apple", "d" => "lemon");
$callback = "myfunction";
$arg = "fruit";

array_walk_recursive($array, $callback, $arg);

print_r($array);

?>

Array
(
    [a] => Array
        (
            [0] => fruit: oranges
            [1] => fruit: limes
        )

    [b] => fruit: bananas
    [c] => fruit: apples
    [d] => fruit: lemons
)