Minor - use api_get_user_id()

main/inc/ajax/model.ajax.php

@@ -1680,6 +1680,7 @@ switch ($action) {
 
         $result = [];
         if (!empty($sessions)) {
+            $pdfIcon = Display::return_icon('pdf.png', get_lang('CertificateOfAchievement'), [], ICON_SIZE_SMALL);
             foreach ($sessions as $session) {
                 if (api_drh_can_access_all_session_content()) {
                     $count_courses_in_session = SessionManager::get_course_list_by_session_id(
@@ -1691,7 +1692,7 @@ switch ($action) {
                 } else {
                     $count_courses_in_session = count(
                         Tracking::get_courses_followed_by_coach(
-                            $user_id,
+                            api_get_user_id(),
                             $session['id']
                         )
                     );
@@ -1712,7 +1713,7 @@ switch ($action) {
 
                 $detailButtons = [];
                 $detailButtons[] = Display::url(
-                    Display::return_icon('pdf.png', get_lang('CertificateOfAchievement'), [], ICON_SIZE_SMALL),
+                    $pdfIcon,
                     api_get_path(WEB_CODE_PATH).'mySpace/session.php?'
                     .http_build_query(
                         [