Remove file Reftest.php

Looks like an accident.

refs #9009

Reftest.php

@@ -1,23 +0,0 @@
-<?php
-
-class Test
-{
-    protected $filters = array();
-
-    public function work()
-    {
-        foreach ($this->getFilters() as $key => &$value) {
-            $value = 1;
-        }
-    }
-
-    public function &getFilters()
-    {
-        return $this->filters;
-    }
-}
-
-$x = new Test();
-$b =& $x->getFilters();
-$b[1] = 0;
-var_dump($b, $x->getFilters());die;