Minor - fix php code

public/main/admin/user_update_import.php

@@ -207,7 +207,7 @@ function updateUsers($users)
                 foreach ($user['Courses'] as $course) {
                     if (CourseManager::course_exists($course)) {
                         CourseManager::subscribeUser($user_id, $course, $user['Status']);
-                        $course_info = CourseManager::get_course_information($course);
+                        $course_info = api_get_course_info($course);
                         $inserted_in_course[$course] = $course_info['title'];
                     }
                 }

public/main/exercise/answer.class.php

@@ -655,7 +655,7 @@ class Answer
                 ->setHotspotCoordinates($hotSpotCoordinates)
                 ->setHotspotType($hotSpotType);
 
-            $em->merge($quizAnswer);
+            $em->persist($quizAnswer);
             $em->flush();
 
             return $quizAnswer;
@@ -734,7 +734,7 @@ class Answer
                         $quizAnswer->setCorrect($correctAnswerAutoId ? $correctAnswerAutoId : 0);
                     }
 
-                    $em->merge($quizAnswer);
+                    $em->persist($quizAnswer);
                     $em->flush();
                 }
             } else {
@@ -937,7 +937,7 @@ class Answer
                             ->setId($answerId)
                             ->setIdAuto($answerId);
 
-                        $em->merge($quizAnswer);
+                        $em->persist($quizAnswer);
                         $em->flush();
 
                         $correctAnswers[$answerId] = $answer['correct'];
@@ -987,7 +987,7 @@ class Answer
                         ->setId($answerId)
                         ->setIdAuto($answerId);
 
-                    $em->merge($quizAnswer);
+                    $em->persist($quizAnswer);
                     $em->flush();
 
                     $correctAnswers[$answerId] = $correct;

public/main/exercise/unique_answer.class.php

@@ -500,7 +500,7 @@ class UniqueAnswer extends Question
             $quizAnswer
                 ->setId($id);
 
-            $em->merge($quizAnswer);
+            $em->persist($quizAnswer);
             $em->flush();
         }