Problem with PHP5 and Apache2 on WinXP

I wanted to set up and apache server with php5 and mysql on my WinXP Pro machine for testing of my php scripts as i write them.
I set up Apache2 and PHP5 according to very explicit instructions found on several websites offering tutorials on the subject. I have all of my .ini and .dll files and such in the right places and my server starts, displays files with .html and .php extensions. However, as soon as I want to execute a php script as simple as the following:

<?php
if ($id == '1') {

echo "You clicked the link!";

} else {

printf("<a href=\"%s?id=1\">Click Me</a><br>\n", $PHP_SELF);

}
?>

, things go wrong. Following the above code as an example of my problem, it is supposed to display a link with the text "Click Me," with the link pointing back at the script with "?id=1" attached to the end of it. When you click the link and the script sees the value for $id (as per the "if ($id == '1')" statement), it should then print "You clicked the link!" However, all it does it print "Click Me" again. This happens on any script that i send information back at, like forms and such...it just reprints what was originally there. I have tested these scripts on a friend's preconfigured server (IBServer), and they work PERFECTLY. I must be doing something wrong...
If anyone has any ideas as to what the problem might be, please help me! I'm desperate!
Thank you in advance.

Change if "($id == '1')" to "if ($_GET['id'] == '1')". This is a register_globals problem. There's a very good sticky on this topic in the PHP forum that you should definitely check out.

Thank you very much, dhouston. This solved the problem right away. Thanks also for the tip about the register_globals thread; it does shed some light on things I was confused about. Thanks again.

I have had the same problem and after many hours ... the problem is resolved changing one word in php.ini.

If you find php.ini (Windows directory or other) and change register_globals = Off to register_globals = On,
everything is ok. You can read more information in:

http://uk.builder.com/webdevelopment/scripting/0,39026636,39213078-2,00.htm