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I have one main domain: main.com , subdomains: test1.main.com , test2.main.com and other domains one.com , two.com . Now it's done like these: ini_set("session.cookie_domain", ".main.com"); $domain = 'main.com'; login.php $user = $db->query("SELECT id, login FROM users WHERE email=? AND password=?", array($email, $password), "rowassoc"); if($user) { $_SESSION['user_id'] = $user['id']; $_SESSION['user_name'] = $user['login']; $time = 100000; setcookie('email', $email, time() + $time, "/", "." . $domain); setcookie('password', $password, time() + $time, "/", "." . $domain); header('Location: http://' . $user['login'] . "." . $domain); exit; } added on each page: if(!isset($_SESSION['user_id'])) { if(isset($_COOKIE['email']) && isset($_COOKIE['password'])) { $email = $_COOKIE['email']; $password = $_COOKIE['password']; $user = $db->query("SELECT id, login FROM users WHERE email=? AND password=?", array($email, $password), "rowassoc"); if($user) { $_SESSION['user_id'] = $user['id']; $_SESSION['user_name'] = $user['login']; } } } else { $user = $db->query("SELECT id, login FROM users WHERE id=?", array($_SESSION['user_id']), "rowassoc"); if(!$user) { setcookie('email', '', time() , "/", "." . $domain); setcookie('password', '', time() , "/", "." . $domain); unset($_SESSION['user_id']); session_destroy(); setcookie("PHPSESSID","",time(), "/", "." . $domain); } else { $_SESSION['user_id'] = $user['id']; $_SESSION['user_name'] = $user['login']; } } logout.php if(isset($_SESSION['user_id'])) { setcookie('email', '', time() , "/", "." . $domain); setcookie('password', '', time() , "/", "." . $domain); unset($_SESSION['user_id']); unset($_SESSION['use

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