<?php
    session_start();
    if (isset($_SESSION['logged'])) {
        echo '<p>You are logged in.</p>';
    }
    else {
        echo '<p>You are not logged in.</p>';
    }
    if (isset($_POST['password']) && isset($_POST['name'])) {
        mysql_connect(....');
        mysql_select_db('loginsys');
        $username = mysql_real_escape_string($_POST['name']);
        $password = $_POST['password'];
        $result = mysql_query("SELECT * FROM users WHERE username = '$username' AND password = '$password'");
        if (mysql_num_rows($result)) {
            if (isset($_SESSION['logged'])) { echo '<p>You are already logged in.</p>'; }
            else {
                $_SESSION['logged'] = 1;
                echo '<p>Successfully logged in!</p>';
            }
        }
        else {
            echo "<p>Incorrect password!</p>";
            header('Location: login1.php');
        }
    }
    if (!isset($_SESSION['logged'])) {
        echo '<form method="post" action="login1.php">
        Name: <input type="text" name="name" /><br />
        Password: <input type="text" name="password" /><br />
        <input type="submit" value="Login" />';
    }
?>