$_SESSION и $_COOKIE

if($_COOKIE['login'] && $_COOKIE[pass]) {
    if(!$_POST['exit']) {
    echo "
    <form action='index.php?id=exit' method='post'>
    <input name='exit' type='submit' value='Выйти' />
    </form>
    ";
        if($_POST['exit']) {
        setcookie('login', $login);
        setcookie('pass', $pass);
    }
} else {
   echo "
   <form action='index.php?id=enter' method='post'>
   <input name='login' type='text' />
   <input name='pass' type='text' />
   <input name='enter' type='submit' value='Войти' />
   </form>
   ";
   }
if(isset($_POST['login']) && isset($_POST['pass'])) {
$login = $_POST['login'];
$pass = $_POST['pass'];
}
if($_POST['enter']) {
   if(empty($login)) {echo "<br><b>Вы не ввели логин</b>";}
   if(empty($pass)) {echo "<br><b>Вы не ввели пароль</b>";}
   $query = "SELECT user_pass FROM login WHERE userid = '$login'";
   $res = mysql_query($query);
   if(mysql_num_rows($res)>0) {
   $row = mysql_fetch_array($res)
   $time = time();
   }
 
   if($pass == $row['user_pass']) {
   $login = $_COOKIE['login'];
   $pass = $_COOKIE['pass'];
   setcookie('login', $login, $time+1800);
   setcookie('pass', $pass, $time+1800);
   echo "<br><b>Добро пожаловать $login</b>";
   } else {
   echo "<br><b>Пароль не верный</b>";
   }
}

$db = mysql_connect('localhost','root','vertrigo') or die("Не могу подключиться к бд");
mysql_select_db('ragsite', $db) or die("БД не найдена");
 
session_start();
if(isset($_POST['log']) && isset($_POST['pass'])) {
$log = $_POST['log'];
$pass = $_POST['pass'];
}
 
 
if($_POST['sub']) {
$log = trim($log);
$log = htmlspecialchars($log);
$log = stripslashes($log);
$pass = trim($pass);
$pass = htmlspecialchars($pass);
$pass = stripslashes($pass);
$pass = md5($pass);
if(empty($log)) {echo "<p>Вы не ввели логин</p>";}
if(empty($pass)) {echo "<p>Вы не ввели пароль</p>";}
 
$query = "select user_pass from login where userid = '$log' and user_pass = '$pass'";
$sql = mysql_query($query) or die("Fatal Error");
if(mysql_num_rows($sql)==1) {
$row = mysql_fetch_assoc($sql);
$_SESSION['log'] = $row['userid'];
$_SESSION['pass'] = $row['user_pass'];
echo "Вы вошли как $log";
 
        }
}
?>
<?PHP
if(!$_SESSION['log'] && !$_SESSION['pass']) {
echo "<form action='?id=enter' method='post'>
Введите логин: <input name='log' type='text' size='' maxlength='10' /><br>
Введите пароль: <input name='pass' type='password' maxlength='15' />
<input name='sub' type='submit' value='Войти' />
</form>";
} else {
echo "
<form action='?id=exit' method='post'>
<input name='exit' type='submit' value='Выйти' />
</form>
";
        if($_POST['exit']) {
        unset($_SESSION['log']);
        unset($_SESSION['pass']);
 
        }
}

session_start();

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at C:\site\java\index.php:1) in C:\site\java\index.php on line 8
 
Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at C:\site\java\index.php:1) in C:\site\java\index.php on line 8

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at C:\site\java\index.php:1) in C:\site\java\index.php on line 2
 
Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at C:\site\java\index.php:1) in C:\site\java\index.php on line 2

<?php
session_start();
$host = "localhost"; // Хост
$name = ""; // Имя привелегии
$pass = ""; // Пароль привелегии
$mydb = ""; // Имя БД
$link = mysql_connect($host,$name,$pass);
mysql_select_db($mydb,$link);
mysql_query("SET NAMES `cp1251`");
unset($host,$name,$pass,$mydb,$link);
$sitename = "Warriors";
$style = "style.css";
$favicon = "favicon.png";
 
if(isset($_COOKIE['Authorization']) and $_COOKIE['Authorization'] != "")
{
    $auth = explode(",", $_COOKIE['Authorization']);
    $result = mysql_query("SELECT `id`,`password` FROM `players` WHERE `login` = '$auth[0]'");
    $row = mysql_fetch_array($result);
    if(isset($row['id']) and $auth[1] == $row['password'])
    {
        setcookie("Authorization","$login,$auth[1]", time() + 1800);
        $_SESSION['ID'] = $row['id'];
        header("Location: index.php");
    }
    else
    {
        setcookie("Authorization","");
        unset($_COOKIE['Authorization']);
    }
}
?>

<?php include("config.php"); $pagename = "Авторизоваться"; if($_SESSION['ID'] != ""){header("Location: index.php");} ?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1251">
<title><?php echo "$sitename - $pagename"; ?></title>
<link href="<?php echo $style; ?>" rel="stylesheet" type="text/css">
<link href="<?php echo $favicon; ?>" rel="shortcut icon" type="image/x-icon">
</head>
 
<body>
<table width="600" border="1" align="center" cellpadding="0" cellspacing="1">
<tr>
<td valign="top">
<?php
echo "<h4 align='center'>$pagename</h4>";
if(isset($_POST['submit']))
{
    if(isset($_POST['login']))
    {
        $login = $_POST['login'];
    }
    
    if(isset($_POST['password']))
    {
        $password = $_POST['password'];
    }
    
    if($login == "")
    {
        unset($login);
        echo "<p>Введите <b>логин</b>!</p>";
    }
    
    if($password == "")
    {
        unset($password);
        echo "<p>Введите <b>пароль</b>!</p>";
    }
    else
    {
        $password = md5($password);
    }
    
    $login = mysql_real_escape_string($login);
    
    if(isset($login) and isset($password))
    {
        $result = mysql_query("SELECT `id`,`password` FROM `players` WHERE `login` = '$login'");
        $row = mysql_fetch_array($result);
        if(isset($row['id']) and $password == $row['password'])
        {
            setcookie("Authorization","$login,$row[password]", time() + 1800);
            $_SESSION['ID'] = $row['id'];
            header("Location: index.php");
        }
        else
        {
            echo "<p>Неверный логин/пароль.</p><p><a href='login.php'>Заново</a></p>";
        }
    }
    else
    {
        echo "<p><a href='login.php'>Заново</a></p>";
    }
}
else
{
    if(isset($_COOKIE['Authorization']) and $_COOKIE['Authorization'] != "")
    {
        $auth = explode(",", $_COOKIE['Authorization']);
        $result = mysql_query("SELECT `id`,`password` FROM `players` WHERE `login` = '$auth[0]'");
        $row = mysql_fetch_array($result);
        if(isset($row['id']) and $auth[1] == $row['password'])
        {
            setcookie("Authorization","$login,$auth[1]", time() + 1800);
            $_SESSION['ID'] = $row['id'];
            header("Location: index.php");
        }
        else
        {
            setcookie("Authorization","");
            unset($_COOKIE['Authorization']);
        }
    }
    
    echo "<form name='form1' method='post' action='login2.php'>
<p align='center'>
<label>Логин:<br>
<input name='login' type='text' id='login' size='25' maxlength='30'>
</label>
</p>
<p align='center'>
<label>Пароль:<br>
<input name='password' type='password' id='password' size='25' maxlength='100'>
</label>
</p>
<p align='center'>
<label>
<input type='submit' name='submit' id='submit' value='Авторизоваться'>
</label>
</p>
</form>
";
}
?>
</td>
</tr>
</table>
</body>
</html>

header("Location: index.php");

setcookie('Authorization', '$login,$row[user_pass]', time() + 1800);

setcookie("Auth","$login,$row[user_pass]", time() + 1800);