This article is dedicated to give you tips on how to go about fixing some of these issues:
1) Register Globals turned off. As of PHP 5.4, PHP no longer supports registerglobals = on option and any code written with register globals enabled will either throw an error such as:
Warning: include_once() [function.include]: Failed opening 'file.php' for
To fix this, you need to ensure your code is using the right paramters such as:
$DOCUMENT_ROOT variable should be replaced with _SERVER["DOCUMENT_ROOT"]
Any GET or POST requets must be written as $_GET or $_POST
Files can be updated using the "replace" command from jailshell or using a program like Notepad++