Replace the DOCUMENT_ROOT and PROJECT_ROOT variables

Use the __DIR__ constant and dirname as needed

core/default_settings/default_settings.php

@@ -212,7 +212,7 @@
 
 
 //get the list of installed apps from the core and mod directories
-	$config_list = glob($_SERVER["DOCUMENT_ROOT"] . PROJECT_PATH . "/*/*/app_config.php");
+	$config_list = glob(dirname(__DIR__, 2) . "/*/*/app_config.php");
 	$x=0;
 	foreach ($config_list as $config_path) {
 		include($config_path);