Fix PHP warning + show header when api_not_allowed()

main/social/group_invitation.php

@@ -185,7 +185,7 @@ if (is_array($members) && count($members) > 0) {
         $member['image'] = '<img class="img-circle" src="'.$image.'"  width="50px" height="50px"  />';
     }
 
-    $userList .= Display::return_sortable_grid(
+    $userList = Display::return_sortable_grid(
         'invitation_profile',
         array(),
         $members,

main/social/group_members.php

@@ -12,7 +12,7 @@ require_once __DIR__.'/../inc/global.inc.php';
 api_block_anonymous_users();
 
 if (api_get_setting('allow_social_tool') != 'true') {
-    api_not_allowed();
+    api_not_allowed(true);
 }
 
 $this_section = SECTION_SOCIAL;
@@ -22,11 +22,11 @@ $user_role = '';
 
 //todo @this validation could be in a function in group_portal_manager
 if (empty($group_id)) {
-    api_not_allowed();
+    api_not_allowed(true);
 } else {
     $group_info = $userGroup->get($group_id);
     if (empty($group_info)) {
-        api_not_allowed();
+        api_not_allowed(true);
     }
     $user_role = $userGroup->get_user_group_role(
         api_get_user_id(),
@@ -41,7 +41,7 @@ if (empty($group_id)) {
         )
     )
     ) {
-        api_not_allowed();
+        api_not_allowed(true);
     }
 }
 
@@ -178,12 +178,12 @@ foreach ($users as $user) {
 if (count($new_member_list) > 0) {
     $social_right_content .= Display::return_sortable_grid(
         'list_members',
-        array(),
+        [],
         $new_member_list,
         array('hide_navigation' => true, 'per_page' => 100),
-        array(),
+        [],
         false,
-        array(true, false, true, true, false, true, true)
+        array(true, false, true, false, false, true, true)
     );
 }