AS3: How to restrict urlvariables to send variables with POST method?

Hi Everyone,

I am struggling with urlvariables of AS3, they are sending variables with GET method while i am using POST method, Please help,

Here is my code:

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AS3

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req = new URLRequest(url);

user_lead = new URLVariables();

vars['email'] = "test@test.com";

vars['content']= "dummy Contents here";

req.data = vars;               

req.method = URLRequestMethod.POST;               

ldr = new URLLoader();

ldr.dataFormat = URLLoaderDataFormat.TEXT;

//ldr.dataFormat = URLLoaderDataFormat.VARIABLES;

ldr.addEventListener(Event.COMPLETE, checkResponse);

ldr.addEventListener(IOErrorEvent.IO_ERROR, IOErrorHandler);

ldr.addEventListener(HTTPStatusEvent.HTTP_STATUS, httpStatusHandler);               

ldr.load(req);

navigateToURL(req);

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PHP:

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<?php

    echo $_POST["email"];      //NOT WORKING

    //echo $_REQUEST["email"];  working fine

    //echo $_GET["email"];  working fine

?>

Thanks,

Maani