title: File path in php require
body: <p>I've inherited some code:</p>
  
  <pre><code>include('../cfg/db_setup.php');
  require('./fpdf/fpdf.php');
  </code></pre>
  
  <p>I know that ../cfg means start in the current directory, then go up one level and down into the cfg dir. What does the ./fpdf mean? I've never seen a single dot slash used in a file path, and can't seem to find the fpdf directory anywhere on our server, but the code is working so apparently it's there somewhere.</p>