Codice login:
Codice PHP:

<?php
error_reporting(E_ALL);
session_start();
include("../config.php");
$script='<link rel="stylesheet" href="../css/login.css" type="text/css" />';
if(!isset($_SESSION['admin'])){
    if(!isset($_GET['action'])){
        $content='<div id="container">
    <div id="content">
        <h2>Per cortesia devi loggarti</h2>        

Inserisci il tuo nome utente e password per continuare.</p>

        <form method="post" action="login.php?action=attendere">
        <div class="form_container">

            <div class="label"><label for="username">Nome utente:</label></div>

            <div class="field"><input type="text" name="username" id="username" class="text_input initial_focus" /></div>

            <div class="label"><label for="password">Password:</label></div>
            <div class="field"><input type="password" name="password" id="password" class="text_input" /></div>

        </div>
        <p class="submit">
            <input type="submit" value="Login" />
        </p>
        </form>
    </div>
</div>
';
    }elseif($_GET['action']=="attendere"){
        if($_POST['username']==$username && $_POST['password']==$password){
            $_SESSION['admin']=1;
            header("Location: home.php");
        }else{
            header("Location: login.php");
        }
    }
}else{ 
    header("Location: home.php");
};
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Effettua il login</title>
<?=$script?>
</head>
<body>
<?=$content?>
</body>
</html>
Qui c'è la sessione admi che e vale 0 ti fa fare l'accesso altrimenti ti spedisce allahome del pannello..