This example also demonstrates the simple PHP script to establish a database (MySQL) connection and validate username and password against the table in database.

In AS3, we can use flash.net.URLLoader, URLRequest and URLVariables class to send and load data. First create a class named SendAndLoadExample.

Class SendAndLoadExample:

package {

import flash.events.*
import flash.net.*;

public class SendAndLoadExample {

public function SendAndLoadExample() {}
public function sendData(url:String, _vars:URLVariables):void {
var request:URLRequest = new URLRequest(url);
var loader:URLLoader = new URLLoader();
loader.dataFormat = URLLoaderDataFormat.VARIABLES;
request.data = _vars;
request.method = URLRequestMethod.POST;
loader.addEventListener(Event.COMPLETE, handleComplete);
loader.addEventListener(IOErrorEvent.IO_ERROR, onIOError);
loader.load(request);
}
private function handleComplete(event:Event):void {
var loader:URLLoader = URLLoader(event.target);
trace("Par: " + loader.data.par);
trace("Message: " + loader.data.msg);
}
private function onIOError(event:IOErrorEvent):void {
trace("Error loading URL.");
}
}
}

Now, create an object of SendAndLoadExample class in Flex.

SendAndLoadExample.mxml

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
		layout="vertical">
<mx:Script>
<![CDATA[
import flash.net.URLVariables;
private var mySendAndLoadExample:SendAndLoadExample;
mySendAndLoadExample = new SendAndLoadExample();
private function sendAndLoad():void {
var url:String = "http://[your server]/login.php";
var variables:URLVariables = new URLVariables();
variables.UserName = "tushar";
variables.Password = "my_password";
mySendAndLoadExample.sendData(url, variables);
}
]]>
</mx:Script>
<mx:Button label="Fetch data" click="sendAndLoad()"/>
</mx:Application>

PHP file for login check: login.php

<?
$clientUserName=$_POST['UserName'];
$clientPassword=$_POST['Password'];
//////////////////////////////////////
// Host name
$host="[your server]";
// Mysql username
$username="[MySql database username]";
// Mysql password
$password="[MySql database password]";
// Database name
$db_name="[MySql database name]";
// Table name
$tbl_name="[MySql table name having usernames and passwords]";
function makeConnection() {
// Connect to server and select databse.
mysql_connect("$GLOBALS[host]", "$GLOBALS[username]",
		"$GLOBALS[password]")or die("cannot connect");
mysql_select_db("$GLOBALS[db_name]")or die("cannot select DB");
}
function fireQuery($query) {
$result=mysql_query($query);
return $result;
}
function printOutput($code, $msg){
print "par=$code&msg=$msg";
}
//////////////////////////////////////
function checkUserID($id, $password) {
$sql="SELECT * FROM $GLOBALS[tbl_name] WHERE
		userName='$id' and password='$password'";
$result=fireQuery($sql);
$count=mysql_num_rows($result);
if($count==1){
return true;
}
return false;
}
function init(){
if(isSet($GLOBALS["clientUserName"])
	&& isSet($GLOBALS["clientPassword"])){
makeConnection();
if(checkUserID($GLOBALS["clientUserName"]
	, $GLOBALS["clientPassword"])){
printOutput("1", "Login successful.");
} else {
printOutput("0", "Failed to login $GLOBALS[clientUserName].");
}
} else {
printOutput("0", "Required parameters missing.");
}
}
init();
?>

fin.