PHP Mongo extension class for AppFog

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<?php
/**
 * AppFogMongo Class
 * Designed for AppFog Platform as a Service (PaaS). Obtains the connection details and esteblishes a connection to the Db. Extends PHPs Mongo Class.
 *
 * @author Phil Kershaw
 */
class AppFogMongo extends Mongo
{
      /**
       * Contructor
       * Captures the Db connection details from the VCAP_SERVICES environment variable and establishes a connection to the Db
       *
       */
      public function __construct()
      {
            $services_json = json_decode(getenv("VCAP_SERVICES"), true);
            $$mongo_config = $services_json["mongodb-1.8"][0]["credentials"];

            $username = $$mongo_config["username"];
            $password = $$mongo_config["password"];
            $hostname = $$mongo_config["hostname"];
            $port = $$mongo_config["port"];
            $db = $$mongo_config["db"]; 

            $this->db = parent::__construct("mongodb://${hostname}:${port}", array(
                              'username' => $username,
                              'password' => $password,
                              'db'       => $db
                              ));
      }
}