as3PostJson.as

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;

submitbtn.addEventListener(MouseEvent.CLICK, sendData)

function sendData(event:MouseEvent):void
{
  
// Create the POST request  test.php would actually be /send.php in your version
var request:URLRequest = new URLRequest("test.php");
request.method = URLRequestMethod.POST;

// Create the variables object that contains what is sent to the php script
var vars:URLVariables = new URLVariables();

//this array will hold all of our part objects
var partList = [];

//add a part. you can use whatever you want attribute names. 

partList.push({
	 'partName' : 'leftSide',
	 'width' : '12',
	 'height' : '10',
	 'type' : 'closed',
	 'orientation' : 'vertical'
 });

//add another
partList.push({
	 'partName' : 'door',
	 'size' : '5x7',
	 'cuts' : 'none',
	 'motor' : 'none'
 });
			 
//add another part			 
partList.push({
	'partName' : 'door',
	'size' : '10x4',
	'cuts' : '45',
	'motor' : 'yes'
});

//serialize array so we can send it in a POST
vars.parts = JSON.stringify(partList);

//add to the post data for sending
request.data = vars;

//post to page!
navigateToURL(request, "_self");
}