Recursion to sanitize user input

[<zooming@xxxxxxxxxxx>]

I'm trying to sanitize my user input.  My sanitize function does not work if
I send a variable that's an array.  I'm using recursion to go through the
array.  The example below shows that $_POST['city'] works but $_POST['user']
doesn't work.  The array comes back blank.

Anyone see what's wrong with my code?

OUTPUT:

Array
(
    [city] => New York
    [user] =>
)

CODE:

<?php

function sanitize($userInput = '')
{
    if ( is_array($userInput) )
    {
        foreach ( $userInput as $key => $value )
        {
            sanitize( $value );
        }
    }
    else
    {
        if ( get_magic_quotes_gpc() )
        {
            return trim( $userInput );
        }
        else
        {
            return trim( addslashes($userInput) );
        }
    }
}

$_POST['city'] = 'New York';
$_POST['user']['firstName'] = 'Bob';
$_POST['user']['lastName'] = 'Smith';
$_POST['user']['country'] = 'USA';

foreach ( $_POST as $key => $value )
{
 $_POST[$key] = sanitize( $value );
}

echo '<pre>';
echo print_r($_POST);
echo '</pre>';

?>

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