Fixing php notices

main/group/group.php

@@ -73,12 +73,12 @@ Display::display_introduction_section(TOOL_GROUP);
 /*
  * Self-registration and unregistration
  */
- $my_group_id = Security::remove_XSS($_GET['group_id']);
- $my_msg	  = Security::remove_XSS($_GET['msg']);
- $my_group    = $_POST['group'];
- $my_get_id1  = Security::remove_XSS($_GET['id1']);
- $my_get_id2  = Security::remove_XSS($_GET['id2']);
- $my_get_id   = Security::remove_XSS($_GET['id']);
+ $my_group_id = isset($_GET['group_id']) ? intval($_GET['group_id']) : null;
+ $my_msg	  = isset($_GET['msg']) ? Security::remove_XSS($_GET['msg']) : null;
+ $my_group    = isset($_GET['group']) ? Security::remove_XSS($_POST['group']) : null;
+ $my_get_id1  = isset($_GET['id1']) ? Security::remove_XSS($_GET['id1']) : null;
+ $my_get_id2  = isset($_GET['id2']) ? Security::remove_XSS($_GET['id2']) : null;
+ $my_get_id   = isset($_GET['id']) ? Security::remove_XSS($_GET['id']) : null;
 
 if (isset($_GET['action'])) {
 	switch ($_GET['action']) {

main/group/group_space.php

@@ -59,7 +59,7 @@ Display::display_header($nameTools.' '.stripslashes($current_group['name']), 'Gr
 
 /*	Introduction section (editable by course admin) */
 
-Display::display_introduction_section(group_space_.$_SESSION['_gid']);
+Display::display_introduction_section(TOOL_GROUP);
 
 /*	Actions and Action links */
 

main/inc/introductionSection.inc.php

@@ -105,7 +105,7 @@ if ($intro_editAllowed) {
 
 	/* Delete Command */
 	if ($intro_cmdDel) {
-		Database::query("DELETE FROM $TBL_INTRODUCTION WHERE id='".$moduleId."' AND session_id='".intval($session_id)."'");
+		Database::query("DELETE FROM $TBL_INTRODUCTION WHERE c_id = $course_id AND id='".$moduleId."' AND session_id='".intval($session_id)."'");
 		Display::display_confirmation_message(get_lang('IntroductionTextDeleted'));
 	}
 }
@@ -115,7 +115,8 @@ if ($intro_editAllowed) {
 
 /* Retrieves the module introduction text, if exist */
 
-$sql = "SELECT intro_text FROM $TBL_INTRODUCTION WHERE id='".Database::escape_string($moduleId)."' AND session_id='".intval($session_id)."'";
+$sql = "SELECT intro_text FROM $TBL_INTRODUCTION 
+        WHERE c_id = $course_id AND id='".Database::escape_string($moduleId)."' AND session_id='".intval($session_id)."'";
 $intro_dbQuery = Database::query($sql);
 if (Database::num_rows($intro_dbQuery) > 0) {
 	$intro_dbResult = Database::fetch_array($intro_dbQuery);