Replace null with '' string see BT#13024

main/admin/configure_plugin.php

@@ -72,9 +72,9 @@ if (isset($form)) {
                 'setting',
                 'Plugins',
                 $pluginName,
-                null,
-                null,
-                null,
+                '',
+                '',
+                '',
                 $_configuration['access_url'],
                 1
             );

main/admin/settings.lib.php

@@ -603,7 +603,6 @@ function storeRegions()
 
     // Get a list of all current 'Plugins' settings
     $installed_plugins = $plugin_obj->get_installed_plugins();
-
     $shortlist_installed = array();
     if (!empty($installed_plugins)) {
         foreach ($installed_plugins as $plugin) {
@@ -612,7 +611,6 @@ function storeRegions()
             }
         }
     }
-    $shortlist_installed = array_flip(array_flip($shortlist_installed));
 
     $plugin_list = $plugin_obj->read_plugins_from_path();
 

main/inc/lib/api.lib.php

@@ -5334,25 +5334,24 @@ function &api_get_settings($cat = null, $ordering = 'list', $access_url = 1, $ur
  * @param string $scope The scope
  * @param string $subKeyText The subkey text
  * @param int $accessUrlId The access_url for which this parameter is valid
- * @param int $visiblity The changeability of this setting for non-master urls
+ * @param int $visibility The changeability of this setting for non-master urls
  * @return int The setting ID
  */
 function api_add_setting(
     $value,
     $variable,
-    $subKey = null,
+    $subKey = '',
     $type = 'textfield',
-    $category = null,
-    $title = null,
-    $comment = null,
-    $scope = null,
-    $subKeyText = null,
+    $category = '',
+    $title = '',
+    $comment = '',
+    $scope = '',
+    $subKeyText = '',
     $accessUrlId = 1,
-    $visiblity = 0
+    $visibility = 0
 ) {
     $em = Database::getManager();
     $settingRepo = $em->getRepository('ChamiloCoreBundle:SettingsCurrent');
-
     $accessUrlId = (int) $accessUrlId ?: 1;
 
     $criteria = ['variable' => $variable, 'accessUrl' => $accessUrlId];
@@ -5388,7 +5387,7 @@ function api_add_setting(
         ->setScope($scope)
         ->setSubkeytext($subKeyText)
         ->setAccessUrl($accessUrlId)
-        ->setAccessUrlChangeable($visiblity);
+        ->setAccessUrlChangeable($visibility);
 
     $em->persist($setting);
     $em->flush();

main/inc/lib/plugin.class.php

@@ -791,6 +791,7 @@ class Plugin
         $langString = str_replace('Plugin', '', get_class($this));
         $pluginName = strtolower($langString);
         $pluginUrl = 'plugin/'.$pluginName.'/'.$filePath;
+
         if ($showTab === 'true') {
             $tabAdded = $this->addTab($langString, $pluginUrl);
             if ($tabAdded) {

main/inc/lib/plugin.lib.php

@@ -158,9 +158,9 @@ class AppPlugin
             'setting',
             'Plugins',
             $pluginName,
-            null,
-            null,
-            null,
+            '',
+            '',
+            '',
             $urlId,
             1
         );
@@ -479,7 +479,6 @@ class AppPlugin
      */
     public function add_to_region($plugin, $region)
     {
-        $access_url_id = api_get_current_access_url_id();
         api_add_setting(
             $plugin,
             $region,
@@ -487,10 +486,10 @@ class AppPlugin
             'region',
             'Plugins',
             $plugin,
-            null,
-            null,
-            null,
-            $access_url_id,
+            '',
+            '',
+            '',
+            api_get_current_access_url_id(),
             1
         );
     }