strange issue with FLASH/PHP - php

Question

i am having strange issue with Flash and PHP. actually i have one Forgot password form in flash in which user enters his email id and when presses submit button flash passes data to PHP and retrieves(here i am stuck) data from PHP.
The issue is Flash getting UNDEFINED from PHP.
my flash code.
var email_id:RegExp = /(\w|[_.\-])+#((\w|-)+\.)+\w{2,4}+/;
var urlRequest:URLRequest = new URLRequest("forgot_password.php");
var urlVariable:URLVariables = new URLVariables();
var urlLoader:URLLoader = new URLLoader();
urlLoader.dataFormat = URLLoaderDataFormat.VARIABLES;
urlLoader.addEventListener(Event.COMPLETE, urlLoader_complete);
btn_submit.addEventListener(MouseEvent.CLICK, btn_submit_click);
function btn_submit_click(e:Event)
{
if(txt_email.text == "")
{
txt_error.text = "Email can not be blank.";
}
else if(!email_id.test(txt_email.text))
{
txt_error.text = "Enter proper email address.";
}
else
{
urlVariable.mailId = txt_email.text;
urlRequest.data = urlVariable;
urlLoader.load(urlRequest);
}
}
function urlLoader_complete(e:Event)
{
trace(e.target.data.return_var); // **it receive Undefined** i am checking in flashlog.txt :(
//txt_error.text = e.target.data.return_var;
}
my PHP code
<?php
require_once('connection.php');
$query = "select * from user_account where email='".$_REQUEST['mailId']."'";
$result = mysql_query($query);
if(mysql_num_rows($result) > 0)
{
echo "return_var=success";
}
else
{
echo "return_var=failed";
}
?>
there is a space before return_var but i don't know why.. i have checked my PHP file 100 times it is perfect than what is the issue??????????????????????????????????????????
EDIT:
If i am tracing
trace(e.target.data);
it traces
%20return%5Fvar=success
Note %20 before return%5var // what is that?????????????

Answer 1

Obviously problem isn't in PHP, anyway you should write it something like this to prevent SQL injection...
<?php
require_once 'connection.php';
$email = $_GET['mailId'];
$email = mysql_real_escape_string($email);
$query = "SELECT email FROM user_account WHERE email = '$email' LIMIT 1";
$result = mysql_query($query);
echo (mysql_num_rows($result) > 0)? 'return_var=success': 'return_var=failed';
?>

Answer 2

Remove this line:
urlLoader.dataFormat = URLLoaderDataFormat.VARIABLES;
and change your urlLoader_complete() function to:
function urlLoader_complete(e:Event)
{
var loader:URLLoader = URLLoader(e.target);
var vars:URLVariables = new URLVariables(loader.data);
trace(vars.return_var);
}
does that help?

Answer 3

First of all thank you all for your contributions.
Now the issue was not related with Flash or PHP but it was related with our server. if i am creating PHP file and directly saving on our server than that PHP file gives response with adding one space before variable name. and if i am creating PHP file and saving it in my local drive and than pasting it on my server it works perfectly!!!!!!!!!!!!!!!!!
see the response difference between two files..............
return_var=success
return_var=success // adding space before response.
may be its issue related with memory but now its working fine so cheers!!!!!!!!!
Again many Thanx.