Sesje php - zapamiętywanie danych do bazy

Kod:

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">

<title>mysql local</title>

</head>

<body>



<form action="selectdb.php" method="post">

<center>

Login:&nbsp;<input type="text" name="login" size="10" maxlength="20"><br>

Hasło:&nbsp;<input type="password" name="pass" size="10" maxlength="20"><br>

<input type="submit" value="Zaloguj"/>

</center>

</form>



</body>

</html>

Kod:

<?php

    session_start(); 

    //sprawdzamy warunek i przypisujemy posta do sesji

    if($_POST['login'])$_SESSION['login']=$_POST['login'];

    if($_POST['pass'])$_SESSION['pass']=$_POST['pass'];

    $login=$_SESSION['login'];

    $pass=$_SESSION['pass'];

?>

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">

<title>mysql local</title>

</head>

<body>

<center><h1> Panel Admnistracyjny MySQL</h1></center>

<form action="baza.php" method="post">

<?php



    $host = "localhost";

    

    //sprawdzanie połączenia z bazą

    @$db = mysql_pconnect($host, $login, $pass);

    if(!$db)

        {

            echo "<center>błędny login lub hasło</center><br>";

            exit;

        }

    else

            echo "<center>zalogowany poprawnie !</center><br>";

?>

Baza:&nbsp;<select name="baza">

            <option value="local">local

            <option value="nie">niewybierajtej

            </select><br>

<input type="submit" value="wybierz"/>

</form>

</body>

</html>

Kod:

<?php

    session_start();

    $login = $_SESSION['login'];

    $pass = $_SESSION['pass'];

?>

    

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">

<title>mysql local</title>

</head>

<body>

<?php

    

    $baza = $_POST['baza'];

    $host = "localhost";



    echo "<h1><br><center>baza: ";

    echo $_POST['baza'];

    echo "</center></h1>";



    //sprawdzanie połączenia z bazą

    @$db = mysql_pconnect($host, $login, $pass);

    if(!$db)

        {

            echo "<center>błędny login lub hasło</center><br>";

            exit;

        }

    else

            echo "<center>zalogowany poprawnie !</center><br>";

    //wybór bazy danych

    $baza = mysql_select_db($baza,$db);



    //formuła pytania SQL

    $res = mysql_query("select * from produkty",$cn);

    echo "<table><tr>";

    $n = mysql_num_fields($res); // ile kolumn

        for($i=0; $i<$n; $i++) // wyświetl nagłówki

            echo "<th>".mysql_field_name($res,$i)."</th>";

            echo "</tr>";

            while($row = mysql_fetch_array($res)) 

                { // wyświetl wiersze

                echo "<tr>";

                for($i=0; $i<$n; $i++) // dla każdej kolumny

                    echo "<td>".$row[$i]."</td>";

                    echo "</tr>";

                }

    echo "</table>";

?>

</body>

</html>

Kod:

echo $_SESSION['login'];

echo $_SESSION['login'];

echo $login;

echo $pass;

Kod:

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at C:\xampp\xampp\htdocs\selectdb.php:1) in C:\xampp\xampp\htdocs\selectdb.php on line 2



Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at C:\xampp\xampp\htdocs\selectdb.php:1) in C:\xampp\xampp\htdocs\selectdb.php on line 2