Avoid calling categories in every loop.

main/template/default/auth/courses_categories.php

@@ -150,6 +150,8 @@ if ($showCourses && $action != 'display_sessions') {
     $ajax_url = api_get_path(WEB_AJAX_PATH).'course.ajax.php?a=add_course_vote';
     $user_id = api_get_user_id();
 
+    $categoryList = CourseManager::getCategoriesList();
+
     if (!empty($browse_courses_in_category)) {
         foreach ($browse_courses_in_category as $course) {
             $course_hidden = $course['visibility'] == COURSE_VISIBILITY_HIDDEN;
@@ -175,6 +177,8 @@ if ($showCourses && $action != 'display_sessions') {
             // display the course bloc
             $html .= '<div class="col-xs-6 col-sm-6 col-md-3"><div class="items items-courses">';
 
+            $course['category_title'] = isset($categoryList[$course['category']]) ? $categoryList[$course['category']] : '';
+
             // display thumbnail
             $html .= returnThumbnail($course);
 
@@ -267,6 +271,7 @@ echo $cataloguePagination;
 /**
  * Display the course catalog image of a course
  * @param array $course
+ *
  * @return string HTML string
  */
 function returnThumbnail($course)
@@ -285,10 +290,8 @@ function returnThumbnail($course)
 
     $html .= '<div class="image">';
     $html .= '<img class="img-responsive" src="'.$course_medium_image.'" alt="'.api_htmlentities($title).'"/>';
-    $categoryTitle = isset($course['category']) ? $course['category'] : '';
+    $categoryTitle = isset($course['category_title']) ? $course['category_title'] : '';
     if (!empty($categoryTitle)) {
-        $listCategory = CourseManager::getCategoriesList();
-        $categoryTitle = $listCategory[$categoryTitle];
         $html .= '<span class="category">'. $categoryTitle.'</span>';
         $html .= '<div class="cribbon"></div>';
     }
@@ -317,7 +320,6 @@ function returnThumbnail($course)
     return $html;
 }
 
-
 /**
  * Display the title of a course in course catalog
  * @param $course