title: declaring the document root when in sub folder
body: <p>Can anyone help me use the correct way of doing includes. Rather than:
  <code>include('header.php');</code></p>
  
  <p>It's a multi page site and i want to add files into other folders for example an Information folder.</p>
  
  <p>In this information folder i have a file called <code>aboutus.php</code> which has includes to the header in the previous directory.</p>
  
  <p>I thought about using the <code>$_SERVER['DOCUMENT_ROOT']</code> method, but it seems a bit bulky and my site is in a sub folder from the root. So I would have to manually hard code the sub directory. Is there an easier way?</p>