DWCS6: homepage with Log in box that changes

Question

Hello everyone, sorry if my questions are stupid, but i'm sort of new about PHP/mysql, i've just learnt how to use databases and so.
I've checked on google and i couldn't find an answer. I checked on the forum here and i couldn't find what i needed. I'm talking about this:
I'd like to create a Homepage with the usual "Log in" box. And no problems here. Now, after a user logs in,that login box has to "disappear" and be replaced by another box, with "Welcome, UserName!" without the fields of the log in box. To explain better:
Before --> box with " Username field, Password field, Log in button | Register button | Forgot your password?"
After the log in --> box with "Welcome username! | Your control panel | Log out button"
1) How can i change that box to show something before the login and something else after? I have to redirect the user to an equal page but with a different box (like page1 with login box and page2 with the logged in user box)?
2) How can i keep the name of the user in the other pages too? something like "xxx.php?IDuser=<etc etc>" in the links with the recordset of the pages on the IDUser filter (when IDUser is = to the parameter from the URL)?
3) And about the control panel, i have to use IDUser so that user can see his/her data (to check, modify, change, etc)?
Thanks all for the attention.

Answer 1

This is the code of the page. I remade it and removed all the extra things. There are the DW automatic codes for:
- 1 connection, called "amontech"
- recordset, called rsLogin with IDUser, nome, cognome, email, username and password
- 1 server behavior, for the user log in
- the standard html from a model (2 columns + header and footer)
- 1 external CSS file called styles.css
<?php require_once('Connections/amontech.php'); ?>
<?php
if (!function_exists("GetSQLValueString")) {
function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "")
  if (PHP_VERSION < 6) {
    $theValue = get_magic_quotes_gpc() ? stripslashes($theValue) : $theValue;
  $theValue = function_exists("mysql_real_escape_string") ? mysql_real_escape_string($theValue) : mysql_escape_string($theValue);
  switch ($theType) {
    case "text":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;   
    case "long":
    case "int":
      $theValue = ($theValue != "") ? intval($theValue) : "NULL";
      break;
    case "double":
      $theValue = ($theValue != "") ? doubleval($theValue) : "NULL";
      break;
    case "date":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;
    case "defined":
      $theValue = ($theValue != "") ? $theDefinedValue : $theNotDefinedValue;
      break;
  return $theValue;
$colname_rsLogin = "-1";
if (isset($_SESSION['IDUser'])) {
  $colname_rsLogin = $_SESSION['IDUser'];
mysql_select_db($database_amontech, $amontech);
$query_rsLogin = sprintf("SELECT * FROM utenti WHERE IDUser = %s", GetSQLValueString($colname_rsLogin, "int"));
$rsLogin = mysql_query($query_rsLogin, $amontech) or die(mysql_error());
$row_rsLogin = mysql_fetch_assoc($rsLogin);
$totalRows_rsLogin = mysql_num_rows($rsLogin);
?>
<?php
// *** Validate request to login to this site.
if (!isset($_SESSION)) {
  session_start();
$loginFormAction = $_SERVER['PHP_SELF'];
if (isset($_GET['accesscheck'])) {
  $_SESSION['PrevUrl'] = $_GET['accesscheck'];
if (isset($_POST['username'])) {
  $loginUsername=$_POST['username'];
  $password=$_POST['password'];
  $MM_fldUserAuthorization = "";
  $MM_redirectLoginSuccess = "index.php";
  $MM_redirectLoginFailed = "error.php";
  $MM_redirecttoReferrer = false;
  mysql_select_db($database_amontech, $amontech);
  $LoginRS__query=sprintf("SELECT username, password FROM utenti WHERE username=%s AND password=%s",
    GetSQLValueString($loginUsername, "text"), GetSQLValueString($password, "text"));
  $LoginRS = mysql_query($LoginRS__query, $amontech) or die(mysql_error());
  $loginFoundUser = mysql_num_rows($LoginRS);
  if ($loginFoundUser) {
     $loginStrGroup = "";
  if (PHP_VERSION >= 5.1) {session_regenerate_id(true);} else {session_regenerate_id();}
    //declare two session variables and assign them
    $_SESSION['MM_Username'] = $loginUsername;
    $_SESSION['MM_UserGroup'] = $loginStrGroup;     
    if (isset($_SESSION['PrevUrl']) && false) {
      $MM_redirectLoginSuccess = $_SESSION['PrevUrl'];
    header("Location: " . $MM_redirectLoginSuccess );
  else {
    header("Location: ". $MM_redirectLoginFailed );
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>AmonTech |</title>
<link href="style.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div class="container">
  <div class="header"><a href="#"><img src="" alt="Inserite qui il logo" name="Insert_logo" width="220" height="90" id="Insert_logo" style="background-color: #C6D580; display:block;" /></a>
    <!-- end .header --></div>
  <div class="sidebar1">
    <ul class="nav">
      <li><a href="#">Link1</a></li>
      <li><a href="#">Link2</a></li>
      <li><a href="#">Link3</a></li>
      <li><a href="#">Link4</a></li>
    </ul>
    <div id="login_box">
      <p> </p>
      <form id="form1" name="form1" method="POST" action="<?php echo $loginFormAction; ?>">
        <p>User Log Ini</p>
        <p>Username:
          <label for="username"></label>
          <input type="text" name="username" id="username" />
        </p>
        <p>Password:
          <label for="password2"></label>
          <input type="text" name="password" id="password2" />
        </p>
        <p>
          <input type="submit" name="pulsantedati" id="pulsantedati" value="Log In" />
        </p>
      </form>
      <p>  </p>
      <p>Welcome,  !     
      </p>
      </div>
    <p> </p>
    <!-- end .sidebar1 --></div>
  <div class="content">
    <h1> </h1>
    <!-- end .content --></div>
  <div class="footer">
    <p>-----</p>
    <!-- end .footer --></div>
<!-- end .container --></div>
</body>
</html>
<?php
mysql_free_result($rsLogin);
?>