Getting information from php file

The output of my php file looks like this:

[{"id":2,"name":"NRK MP3","url":"http:\/\/lyd.nrk.no\/nrk_radio_mp3_mp3_m","country_id":37},{"id":72,"name":"Radio Loland","url":"http:\/\/stream.radiololand.no:5000\/loland128","country_id":37}]

What i want to accomplish is to get that information, I need the url, the country id, the name, and the id. But I get this error:

Error: Error #2101: The String passed to URLVariables.decode() must be a URL-encoded query string containing name/value pairs.

at Error$/throwError()

at flash.net::URLVariables/decode()

at flash.net::URLVariables()

at DatabaseTest_fla::MainTimeline/onCompleteHandler()[DatabaseTest_fla.MainTimeline::frame1:28]

at flash.events::EventDispatcher/dispatchEventFunction()

at flash.events::EventDispatcher/dispatchEvent()

at flash.net::URLLoader/onComplete()

If I change my php file to this. It works

<?php

   echo "values=8";

?>

My As3 code:

import flash.events.MouseEvent;

import flash.net.URLLoader;

import flash.net.URLRequest;

import flash.net.URLVariables;

import flash.net.URLLoaderDataFormat;

import flash.net.URLRequestMethod;

import flash.events.Event;

var myLoader:URLLoader = new URLLoader();

myLoader.dataFormat = URLLoaderDataFormat.TEXT;

var myRequest:URLRequest=new URLRequest("mydomain.com/something.php");

myLoader.load(myRequest);

myLoader.addEventListener(Event.COMPLETE,onCompleteHandler);

var myValue: String;

function onCompleteHandler(e:Event):void{

          var myvariable: URLVariables = new URLVariables(e.target.data);

         myValue = myvariable.values;

                  trace(myValue);

}