Fix php warnings

main/inc/ajax/lp.ajax.php

@@ -14,7 +14,7 @@ $tbl_lp_item = Database :: get_course_table(TABLE_LP_ITEM);
 $sessionId = api_get_session_id();
 
 switch ($action) {
-    case 'get_documents';
+    case 'get_documents':
         $courseInfo = api_get_course_info();
         $folderId = isset($_GET['folder_id']) ? $_GET['folder_id'] : null;
         if (empty($folderId)) {
@@ -46,9 +46,13 @@ switch ($action) {
                 if ($_REQUEST['type'] == TOOL_QUIZ) {
                     $title = Exercise::format_title_variable($title);
                 }
+
+                $parentId = isset($_REQUEST['parent_id']) ? $_REQUEST['parent_id'] : '';
+                $previousId = isset($_REQUEST['previous_id']) ? $_REQUEST['previous_id'] : '';
+
                 echo $_SESSION['oLP']->add_item(
-                    $_REQUEST['parent_id'],
-                    $_REQUEST['previous_id'],
+                    $parentId,
+                    $previousId,
                     $_REQUEST['type'],
                     $_REQUEST['id'],
                     $title,

main/newscorm/learnpath.class.php

@@ -597,7 +597,7 @@ class learnpath
             "max_score" => $max_score,
             "parent_item_id" => $parent,
             "previous_item_id" => $previous,
-            "next_item_id" => $next,
+            "next_item_id" => itnval($next),
             "display_order" => $display_order +1,
             "prerequisite" => $prerequisites,
             "max_time_allowed" => $max_time_allowed,