The following piece of code works on php4 if you insert a
blank after the comma followed by a comment or a new line. It's ignored. php3 panics (like supposed to be).

  $default_document = array (
    'CATEGORY' => 'l_category',
    'PAGE' => 'l_page',
    'PRODUCT' => 'l_product',
    'CART' => 'l_cart',
    'ORDER' => 'l_order',   # This works.
  );