PHP: htmlspecialchars on an array

Here is a helpful function to perform the htmlspecialchars function on all elements of an array. It will also perform it on arrays within the array.

Below it is the htmlspecialchars_decode version.

function array_htmlspecialchars(&$input)
{
    if (is_array($input))
    {
        foreach ($input as $key => $value)
        {
            if (is_array($value)) $input[$key] = array_htmlspecialchars($value);
            else $input[$key] = htmlspecialchars($value);
        }
        return $input;
    }
    return htmlspecialchars($input);
}

function array_htmlspecialchars_decode(&$input)
{
    if (is_array($input))
    {
        foreach ($input as $key => $value)
        {
            if (is_array($value)) $input[$key] = array_htmlspecialchars_decode($value);
            else $input[$key] = htmlspecialchars_decode($value);
        }
        return $input;
    }
    return htmlspecialchars_decode($input);
}