[PHP] Document root, preferred way to find it???

[Al]

I've been using in my scripts $_SERVER['DOCUMENT_ROOT'] to find the base path 
for includes, etc.

We just moved the site to a new virtual host and it doesn't work.  print_r() 
gives me:

$_SERVER['document_root']= /usr/local/apache/htdocs
$_SERVER['path_translated']= /home/user/public_html/
What do you guys use for you docroot?
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