$_SERVER['DOCUMENT_ROOT'] error

[jrough]

I'm using FX.php examples, the detail.php example has an error on the first line.  I have Apache 1.3 on a Mac.  Does that mean it doesn't define the $_SERVER['DOCUMENT_ROOT']
global?  I have the detail.php file in the document root defined by Filemaker Server Advanced (Library/WebSErver/Documents/detail.php).  Does that mean there are other global variables that aren't defined?  What is happening?  Is it Filemaker Server or Apache?
thanks very much,

Notice: Undefined index: ID in /Library/WebServer/Documents/detail.php on line 5

[jrough]

I think something else is going on. I am getting another error.  It can't find the include file FX.php. 
Warning: include_once(localhost/Library/WebServer/Documents/FX/FX.php) [function.include-once]: failed to open stream: No such file or directory in /Library/WebServer/Documents/detail.php on line 6.  Can I repost?  I have FM Server configured for php.   Should the php pages go in localhost/~jr/Sites/  or in /localhost/Library/WebServer/Documents/  ?
thanks,

[jrough]

I would like to know why the $_SERVER['DOCUMENT_ROOT'] variable is not defined if anyone knows.  I think I got the include files figured out.  Sorry

[Michael Petrov]

Document root is one of those variables that are sometimes defined and sometimes are not. It is rarely needed and you can usually just replace it with the name of the file you want to reference. It is definitely not FileMaker Server though, just Apache not properly configured.