需要帮助从AS3发送数据到PHP

我有一个在Adobe flash actionscript 3中创建的表单，需要帮助来验证我所做的是否正确…我是AS3和PHP的新手，所以任何帮助和解释都会非常感激…

这是我的AS3编码....

processing_mc.visible = false;
function checkComplete(evt:MouseEvent):void {
    // Create A new URLVariables instance to store the variable
    var phpVars:URLVariables = new URLVariables();
    // Create a variable (e.g. candidate) to send
    phpVars.userFirstName = firstname_txt.text;
    phpVars.userLastName = lastname_txt.text;
    phpVars.userNumber = number_txt.text;
    phpVars.userEmail = email_txt.text; 
    phpVars.userMsg = msg_txt.text;
    // Create a new URLRequest instance sending data to "ascom01.php"
    var myRequest:URLRequest = new URLRequest("form.php");
    // Send data using the POST method
    myRequest.method = URLRequestMethod.POST;
    var loader:URLLoader = new URLLoader();
    loader.load(myRequest);
loader.addEventListener(Event.COMPLETE, response);
function response(e:Event):void
{
    trace(loader.data);
}
if(!firstname_txt.length) {
status_txt.text = "Please enter your first name";
} else if(!lastname_txt.length) {
status_txt.text = "Please enter your last name";
} else if (!email_txt.length) {
status_txt.text = "Please enter your email";
} else if (!number_txt.length) {
status_txt.text = "Please enter your phone number";
} else {
}
}
// handler for the PHP script completion and return of status
function completeHandler(event:Event):void {
processing_mc.visible = false;
firstname_txt.text = "";
lastname_txt.text = "";
email_txt.text = "";
number_txt.text = "";
msg_txt.text = "";
status_txt.text = event.target.data.return_msg;
}
// Add event listener for submit button click
submit_btn.addEventListener(MouseEvent.CLICK, checkComplete);

这里是我的PHP编码，我刚刚得到的工作....

<?php 
if(isset($_POST['userFirstName']) && isset($_POST['userLastName']) && isset($_POST['userEmail']) && isset($_POST['userNumber']) && isset($_POST['userMsg']))
{
    $userFirstName=strip_tags($_POST['userFirstName']);
    $userLastName=strip_tags($_POST['userLastName']);
    $userEmail=strip_tags($_POST['userEmail']);
    $userNumber=strip_tags($_POST['userNumber']);
    $userMsg=strip_tags($_POST['userMsg']);
    // connect with database. 
    $username="******";
    $password="******";
    $database="b-elite-fitness";
    mysql_connect("localhost","$username","$password") or die (mysql_error());
    mysql_select_db("$database") or die (mysql_error());
    //query for inserting data in database.
    $query="INSERT INTO `formdp` VALUES('NULL','".mysql_real_escape_string($userFirstName)."','".mysql_real_escape_string($userLastName)."','".mysql_real_escape_string($userEmail)."','".mysql_real_escape_string($userNumber)."','".mysql_real_escape_string($userMsg)."')";
    if($query_run=mysql_query($query))
    {
        echo'Data inserted.';
    } else {
        die(mysql_error());
        }

}
?>  

有谁能帮我找出两者之间的联系吗?我在网上查过了，每个例子都不一样，不能理解它是如何工作的....

var loader:URLLoader = new URLLoader();
loader.load(myRequest);

loader.addEventListener(Event.COMPLETE, response);
function response(e:Event):void
{
    trace(loader.data);
}