Rule Definition
It is highly advised to try to minimize relative paths for files inclusion. The general mechanism for relative path inclusion will search for default include paths, then continue with current directory then so on. So file search in that case may take more time. If however you need to use relatives path, the better practice is to declare the constant called WEB_ROOT which defines the root.

Remediation
Try to limit relative path without using the constant WEB_ROOT.

Violation Code Sample

<?php

include "../A.php"; //violation
?>

Fixed Code Sample

<?php

include $APPROOT."../A.php"; //violation removed
?>