Minor - cosmetic changes

main/admin/statistics/index.php

@@ -82,6 +82,7 @@ switch ($_GET['action']) {
 				get_lang('Students') => statistics::count_users(5,null,$_GET['count_invisible_courses'])
 			)
 		);
+        $teachers = $students = array();
 		foreach ($course_categories as $code => $name) {
 			$name = str_replace(get_lang('Department'),"",$name);
 			$teachers[$name] = statistics::count_users(1,$code,$_GET['count_invisible_courses']);

main/admin/statistics/statistics.lib.php

@@ -115,8 +115,7 @@ class Statistics {
     function get_activities_data($from, $number_of_items, $column, $direction) {
         global $dateTimeFormatLong, $_configuration;
         $track_e_default    		= Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_DEFAULT);
-        $table_user 				= Database::get_main_table(TABLE_MAIN_USER);
-        $table_course 				= Database::get_main_table(TABLE_MAIN_COURSE);
+        $table_user 				= Database::get_main_table(TABLE_MAIN_USER);        
         $access_url_rel_user_table	= Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
         $current_url_id 			= api_get_current_access_url_id();
 
@@ -172,10 +171,10 @@ class Statistics {
                     }
                 }
             }
-        	if (!empty($row[4]) && $row[4] != '0000-00-00 00:00:00') {        	
-            	$row[4] = api_get_local_time($row[4]);
+        	if (!empty($row['default_date']) && $row['default_date'] != '0000-00-00 00:00:00') {        	
+            	$row['default_date'] = api_get_local_time($row['default_date']);
         	} else {
-        		$row[4] = '-';
+        		$row['default_date'] = '-';
         	}
             $activities[] = $row;
         }

main/inc/lib/events.lib.inc.php

@@ -567,14 +567,15 @@ function event_system($event_type, $event_value_type, $event_value, $datetime =
             $event_value = serialize($event_value);
         }
     }
-	$event_value        = Database::escape_string($event_value);
-	$datetime           = Database::escape_string($datetime);
+	$event_value        = Database::escape_string($event_value);	
 	$user_id            = Database::escape_string($user_id);
 	$course_code        = Database::escape_string($course_code);
     
-	if(!isset($datetime)) {
+	if (!isset($datetime)) {
 		$datetime = api_get_utc_datetime();
 	}
+    $datetime           = Database::escape_string($datetime);
+    
 	if(!isset($user_id)) {
 		$user_id = 0;
 	}