protect_dead.php

<?php 
unset($_SESSION['logged_user']);
session_start();


function LoginForm(){

session_start();
require_once('db.php');
$sql_connection = dbConnect();

	if(!empty($_POST['user'])){
	

		$sql_get_info = "SELECT `name`, `password`, `group` FROM `users` WHERE `name` = '".$_POST['user']."' ";
		$data = mysql_query($sql_get_info, $sql_connection) or die; 
	
		if($data['password'] == $_POST['password']){
			$_SESSION['logged_user'] = $_POST['login'];
			
			switch($date['group'])
			{
				case 10:
					{
					$_SESSION['group'] = 10;
					break;
					}
				case 20:
					{
					$_SESSION['group'] = 20;
					break;
					}
				default: {echo "Ваши права неопределены. ";}
			}
			
		}
		else{
			echo "Неверный пароль".
			LoginForm();
		}
	}
	
	echo "
	Авторизуйтесь для продолжения. <br>
	<form method = 'POST'> 
		<input type = 'text' name = 'user'><br>
		<input type = 'password' name = 'password'><br>
		<input type = 'submit'><br>
	</form>";
	die();
	}


if(!isset($_SESSION['logged_user'])){

LoginForm();


}
?>

Успешная авторизация.