Авторизация с куками

setcookie('login',$login,time() + 3600*24);

<?php
 
if (checkUser()) {
    setcookie('login', $_POST['login'], time() + 3600*24);
}else{
    echo "Не верный логин или пароль;";
}
 
function checkUser () {
    $login = $_POST['login'];
    $pwd = $_POST['pwd'];
    
    $link = @mysql_connect('localhost','root','');
    if (!$link) exit ('Not connected to server');
    $db = @mysql_select_db('zf');
    if (!$db) exit ('Not connected to DB');
    
    $query = @mysql_query("SELECT pwd FROM users WHERE login='".$login."';");
    
    $row= mysql_fetch_array($query);
    if ($row['pwd']==$pwd)        return TRUE;
    return FALSE;
}
?>

session_start();
 
ini_set ('session.bug_compat_42', 'off');
 
function login($login_vhod,$password_vhod,$remember)
{
    $_SESSION['login'] = $login;
    
    if($remember == 'on')
    {
        setcookie('login',$login_vhod,time() + 3600*24*14);     
    }
    
    return TRUE;
 
function logout()
    {
        setcookie('login','',time() - 1);   
        unset($login);
    }   
    
}

<?php
 
header('Content-type: text/html; charset=utf-8');
session_start();
error_reporting(-1);
$_SESSION['foo'] = 'bar';
 
setcookie('foo', 'bar', time()+3600*24, '/');
empty($_COOKIE) && header('Location: ' . $_SERVER['PHP_SELF']);
var_dump($_SESSION, $_COOKIE);

<?php
//some php-code...
//....
//....
?>

<?php
 
header('Content-type: text/html; charset=utf-8');
session_start();
error_reporting(-1);
$_SESSION['foo'] = 'bar';
echo 'Hello, errors!<br>';
setcookie('foo', 'bar', time()+3600*24, '/');
empty($_COOKIE) && header('Location: ' . $_SERVER['PHP_SELF']);
var_dump($_SESSION, $_COOKIE);