PHP/Core

* enforced v7.1 compliance, preparations for v7.2
 * removed deprecated usage of each()
 * prefer array deconstruction via [] instead of calling list()
 * try to catch failed session_start()
 * prefer ... - Token instead of calling func_get_args() func_num_args()
 * enforce return types in AjaxHandler
 * revision push

includes/ajaxHandler/filter.class.php

@@ -84,7 +84,7 @@ class AjaxFilter extends AjaxHandler
         $this->handler = 'handleFilter';
     }
 
-    protected function handleFilter()
+    protected function handleFilter() : string
     {
         $url = '?'.$this->page;
 
@@ -106,5 +106,6 @@ class AjaxFilter extends AjaxHandler
         // do get request
         return $url;
     }
+}
 
-}
+?>