Minor - fix query use user.id instead of user.user_id

Author: jmontoyaa

main/admin/course_information.php

@@ -1,5 +1,7 @@
 <?php
+
 /* For licensing terms, see /license.txt */
+
 /**
  * This script gives information about a course.
  *
@@ -68,15 +70,15 @@ function get_course_usage($course, $session_id = 0)
 
     $usage = [];
     $conditionSession = '';
-    if ($session_id !== '') {
-        $session_id = intval($session_id);
+    if ('' !== $session_id) {
+        $session_id = (int) $session_id;
         $conditionSession = " AND session_id = '$session_id' ";
     }
 
     foreach ($tables as $tableInfo) {
         $table = $tableInfo[0];
         $title = $tableInfo[1];
-        $sql = "SELECT COUNT(*) count FROM $table 
+        $sql = "SELECT COUNT(*) count FROM $table
                 WHERE c_id = '$courseId' $conditionSession ";
         $rs = Database::query($sql);
         $row = Database::fetch_array($rs);
@@ -128,12 +130,12 @@ function get_course_usage($course, $session_id = 0)
         FROM $table_course_user cu, $table_user u";
 if (api_is_multiple_url_enabled()) {
     $sql .= " INNER JOIN ".Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER)." url_rel_user
-        ON 
-            u.user_id = url_rel_user.user_id AND 
+        ON
+            u.id = url_rel_user.user_id AND
             url_rel_user.access_url_id = ".api_get_current_access_url_id();
 }
 $sql .= " WHERE
-            cu.user_id = u.user_id AND
+            cu.user_id = u.id AND
             cu.c_id = '".$courseId."' AND
             cu.relation_type <> ".COURSE_RELATION_TYPE_RRHH;
 $res = Database::query($sql);