As per gist https://gist.github.com/codenamegary/88d86fc01b048f539601 …

…just threw up a simple stackable provider with fall backs

example.php

@@ -3,10 +3,15 @@
 require "vendor/autoload.php";
 
 $record_file = 'dns_record.json';
-$storage = new yswery\DNS\JsonStorageProvider($record_file);
+$jsonStorageProvider = new yswery\DNS\JsonStorageProvider($record_file);
+
+// New recursive provider
+$recursiveProvider = new yswery\DNS\RecursiveProvider($options);
+
+$stackableResolver = new yswery\DNS\StackableResolver(array($jsonStorageProvider, $recursiveProvider));
 
 // Creating a new instance of our class
-$dns = new yswery\DNS\Server($storage);
+$dns = new yswery\DNS\Server($stackableResolver);
 
 // Starting our DNS server
 $dns->start();

src/StackableResolver.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace yswery\DNS;
+
+class StackableResolver {
+
+    /**
+     * @var array
+     */
+    protected $resolvers;
+
+    public function __construct(array $resolvers = array())
+    {
+        $this->resolvers = $resolvers;
+    }
+
+    public function get_answer($question) 
+    {
+        foreach ($this->resolvers as $resolver) {
+            $answer = $resolver->get_answer($question);
+            if ($answer) {
+                return $answer;
+            }
+        }
+    }
+
+}