Replace api_array_column with array_column, add fallback for php < 5.5

composer.json

@@ -63,7 +63,8 @@
         "bower-asset/fullcalendar": "2.3.*",
         "bower-asset/mediaelement": "2.16.*",
         "bower-asset/modernizr": "2.8.*",
-        "bower-asset/jqueryui-timepicker-addon": "1.5.*"
+        "bower-asset/jqueryui-timepicker-addon": "1.5.*",
+        "ramsey/array_column": "~1.1"
     },
     "require-dev": {
         "behat/behat": "2.5.*@stable",

main/inc/ajax/model.ajax.php

@@ -198,14 +198,14 @@ switch ($action) {
                 'admin',
                 null
             );
-            $userIdList = api_array_column($userIdList, 'user_id');
+            $userIdList = array_column($userIdList, 'user_id');
             $sessionList = SessionManager::get_sessions_list();
-            $sessionIdList = api_array_column($sessionList, 'id');
+            $sessionIdList = array_column($sessionList, 'id');
 
             $courseCodeList = array();
             foreach ($sessionList as $session) {
                 $courses = SessionManager::get_course_list_by_session_id($session['id']);
-                $courseCodeList = array_merge($courseCodeList, api_array_column($courses, 'code'));
+                $courseCodeList = array_merge($courseCodeList, array_column($courses, 'code'));
             }
         }
 

main/inc/lib/api.lib.php

@@ -8078,29 +8078,3 @@ function apiIsSystemInstalled()
     $version = $settingsRow['selected_value'];
     return array('installed' => 1, 'message' => $version);
 }
-
-/**
- * Fallback for PHP 5.5 array_colum function.
- * Return the values from a single column in the $input array
- * @param array $input Array from which to pull a column of values
- * @param string $columnName The column of values to return
- * @return array
- */
-function api_array_column($input, $columnName)
-{
-    if (function_exists('array_column')) {
-        return array_column($input, $columnName);
-    }
-
-    $result = array();
-
-    foreach ($input as $value) {
-        if (!array_key_exists($columnName, $value)) {
-            continue;
-        }
-
-        $result[] = $value[$columnName];
-    }
-
-    return $result;
-}

main/survey/survey.lib.php

@@ -3405,7 +3405,7 @@ class SurveyUtil
 
         foreach ($groupList as $groupId) {
             $userGroupList = GroupManager::getStudents($groupId);
-            $userGroupIdList = api_array_column($userGroupList, 'user_id');
+            $userGroupIdList = array_column($userGroupList, 'user_id');
             $users_array = array_merge($users_array, $userGroupIdList);
 
             $params = array(