[RESOLVED] PHP includes not working? Includes not working? Undefined variable errors?

[videostars]

I have a page here:
http://alert6.com/clients/CTM/selection.php?id=78033

uses a local php include file

<?php require("./products.php"); ?>

that has each product and information laid out, and called using a switch based on the product id, for example:

switch ($id) {
    case "78018":
		$price = "19.95";	
		$crystal_desc = "78018 - Small Square";	
		$crystal_img = "images/78018_cr001_small_square_300x300web.jpg";	
		$size ="3.1\"L x 1\"W x 2.4\"H"; 
		$imprint="3.1\" x 2.4\""; 
        break;
    case "78019":
		$price = "49.95";	
		$crystal_desc = "78019 - Sunflower 150";	
		$crystal_img = "images/78019_cr002a_150sunflower_300x300web.jpg";	
		$size ="5.9\"L x 1.6\"W x 6.6\"H"; 
		$imprint="5.9\"D"; 
        break;

Now as you can see in the first URL i provided, this works excellently. However, when installing the site onto the client's shared server on godaddy, suddenly the include file does not appear to work properly, and I get a ton of "
Notice: Undefined variable:" errors. see here:
http://crystallizethemoment.com/selection.php?id=78034

I have access to the client's local php.ini file which says

register_globals = off
allow_url_fopen = on
allow_url_include = on

Any ideas why this thing refuses to work on the client server, but not mine?

[bradgrafelman]

$id is probably undefined; instead, you should be using $_GET['id'].

See this manual page for more information about how to retrieve external data: [man]variables.external[/man]. The reason for the change is that register_globals is a deprecated directive that has been removed from future versions of PHP. For some reasons why, see this page: [man]security.globals[/man].

[videostars]

that is exactly what it was. I added the following to the top of the script, and it now works as expected.

$id = $_GET['id'];

thank you for pointing me in the right direction.

[bradgrafelman]

Note that you should never try to access external data without first checking if it exists. For example, one common method of defining the variable in your code would be

$id = (isset($_GET['id']) ? $_GET['id'] : NULL);

// can now check if ($id === NULL)