What format would I use?

1

what format would I use in PHP for a login?

here is the AS in the flash


import mx.controls.*;

var status_lbl:Label;
var username_lbl:Label;
var username_ti:TextInput;
var password_lbl:Label;
var password_ti:TextInput;

// change the colors of the labels
this.username_lbl.setStyle("color", 0xFFFFFF);
this.password_lbl.setStyle("color", 0xFFFFFF);

submit_btn.clickHandler = function() {
	checkForm();
};


var formListener:Object = new Object();
formListener.enter = function(evt) {
	checkForm();
};
username_ti.addEventListener("enter", formListener);
password_ti.addEventListener("enter", formListener);


Selection.setFocus(username_ti);


function checkForm() {

	if (username_ti.text.length == 0) {
		
		status_lbl.text = "<font color=\"#FF0000\">Please enter user name.</font>";
				Selection.setFocus(username_ti);
		
		return false;
	}
	
	if (password_ti.text.length == 0) {
		status_lbl.text = "<font color=\"#FF0000\">Please enter password.</font>";
		Selection.setFocus(password_ti);
		return false;
	}
	// clear the status_lbl Label instance
	status_lbl.text = "";

	var result_lv:LoadVars = new LoadVars();
	var login_lv:LoadVars = new LoadVars();
		login_lv.username = username_ti.text;
	login_lv.password = password_ti.text;
	login_lv.sendAndLoad("http://www.flash-mx.com/mm/login.cfm", result_lv, "POST");
	// When the results are received from the server...
	result_lv.onLoad = function(success:Boolean) {
		
		if (success) {
			
			if (this.isValidLogin == 1) {
				
				status_lbl.text = "<font color=\"#009900\"><b>login successful.</b></font>";
			
			} else {
				status_lbl.text = "<font color=\"#FF0000\">invalid user name / password.</font>";
								Selection.setFocus(username_ti);
				Selection.setSelection(0, username_ti.text.length);
			}
	
		} else {
			status_lbl.text = "<b>Unable to connect to login URL</b>";
			username_ti.enabled = false;
			password_ti.enabled = false;
			submit_btn.enabled = false;
		}
	};
	return true;
}

of course this is the Flash MX 2004 example login…
but how would I set up the PHP for this?
How would I set up mySQL Database?
please help…