title: What is the best practice for including PHP files?
body: <p>What is the best practice for including PHP files?</p>
  
  <p>Is it best to include a <code>include.php</code> file that includes all of the project PHP files?
  Or to include it in those files that need them</p>
  
  <p>Right now, my project has several include files in my <code>index.php</code> file. Does including all of my php files in the index.php make it less efficient?</p>
  
  <p>Lastly, Where should one include the session check PHP file? in all of the PHP files?</p>