php and flash as3 mysql database connection variables

[letschillout]

am connecting flash with mysql database
but not able to get proper variable value.

i want output "connected"
by defining
var s = evt.target.data.server;

also can someone explain me more about these two i.e.
//loader.dataFormat = URLLoaderDataFormat.VARIABLES;
//loader.dataFormat = URLLoaderDataFormat.TEXT;


am getting sometime value i.e.

connected <br> etc .........why am getting html code in it? any idea

Thanks
---------------------------
php connection i.e.

<?php

/** MySQL database username */
define('DB_NAME', 'nippers');
define('DB_USER', 'root');
define('DB_PASSWORD', 'admin');
define('DB_HOST', 'localhost');

$output .="<loginserver>";
$connect = mysql_connect(DB_HOST, DB_USER, DB_PASSWORD) or die(mysql_error());
if (!$connect)
  {
  $output .= "Not Connected";
  //die('Could not connect: ' . mysql_error());
  }
else
{
    $output .= "Connected";
    //echo "Connected to MySQL<br />";
}

// some code
//mysql_close($con);

  $returnVars .="server = connected ";
 
  $output .= "</loginserver>";  
//  print ($output);
  print ($returnVars);



//Selecting database
$select_db = mysql_select_db(DB_NAME, $connect);
if(!$select_db){
die(mysql_error());
}
?>

AS3 code i.e.

import flash.display.MovieClip;
import flash.events.Event;
import flash.net.URLLoader;
import flash.net.URLRequest;
import flash.net.URLRequestMethod;
import flash.text.TextField;
import flash.events.IOErrorEvent;
import flash.net.URLLoaderDataFormat;

    



function Main()  {
    
//var myXML:XML = new XML();
var myXML_URL:String;

var url:String = "http://localhost/score/add/database.php";
var _var:URLVariables = new URLVariables();

var request_url:URLRequest = new URLRequest(url);
var loader:URLLoader = new URLLoader(request_url);
//loader.dataFormat = URLLoaderDataFormat.VARIABLES;
//loader.dataFormat = URLLoaderDataFormat.TEXT;
//request_url.data = myXML.toXMLString();
request_url.method = URLRequestMethod.GET;
//request_url.data = _var;
//request_url.contentType = "text/xml";


loader.addEventListener(Event.COMPLETE, completeHandler);
loader.addEventListener(IOErrorEvent.IO_ERROR, onIOError);
loader.addEventListener(SecurityErrorEvent.SECURITY_ERROR, secerror); 

_var.server = server.text;
loader.load(request_url);

function completeHandler(evt:Event) {
    
    //var data:URLVariables = new URLVariables( loader.data );
    //trace( data.filesize );

  //var _loader:URLLoader = URLLoader(evt.target);
  //trace ("value: "+_loader.data.output);
  
  
  //myXML = XML(loader.data);
  //trace ("value: "+ myXML);
  var s = evt.target.data.server;
  trace ("value: "+ s);
  nowstatus.text = s;
 
}

function onIOError(event:IOErrorEvent):void {
trace("Error loading URL.");
}

function secerror(event:SecurityError) {
    nowstatus.text = event.message;
}
try {
    loader.load(request_url);
}
catch (error:IOError) {
    nowstatus.text = "error: " + error.message;
}
catch (error:Error) {
    nowstatus.text = "error: " + error.message;
} 

}

Main();

[cancerinform]

try this:
$returnVars .="server=".$output;