session_start

[jspodisus]

who can help me?i received this errors:

 

Notice: Undefined index: id in y:\home\login\www\index.php on line 18

 

Notice: Undefined index: submit in y:\home\login\www\index.php on line 39

 

Notice: Undefined index: submit in y:\home\login\www\index.php on line 82

 

and this is a code:

<?php

define('INCLUDE_CHECK',true);

require 'connect.php';
require 'functions.php';
// Those two files can be included only if INCLUDE_CHECK is defined

session_start();

session_name('tzLogin');
// Starting the session

session_set_cookie_params(2*7*24*60*60);
// Making the cookie live for 2 weeks


if($_SESSION['id'] && !isset($_COOKIE['tzRemember']) && !$_SESSION['rememberMe'])
{
    // If you are logged in, but you don't have the tzRemember cookie (browser restart)
    // and you have not checked the rememberMe checkbox:

    $_SESSION = array();
    session_destroy();
    
    // Destroy the session
}


if(isset($_GET['logoff']))
{
    $_SESSION = array();
    session_destroy();
    
    header("Location: index.php");
    exit;
}

if($_POST['submit']=='Login')
{
    // Checking whether the Login form has been submitted
    
    $err = array();
    // Will hold our errors
    
    
    if(!$_POST['username'] || !$_POST['password'])
        $err[] = 'All the fields must be filled in!';
    
    if(!count($err))
    {
        $_POST['username'] = mysql_real_escape_string($_POST['username']);
        $_POST['password'] = mysql_real_escape_string($_POST['password']);
        $_POST['rememberMe'] = (int)$_POST['rememberMe'];
        
        // Escaping all input data

        $row = mysql_fetch_assoc(mysql_query("SELECT id,usr FROM tz_members WHERE usr='{$_POST['username']}' AND pass='".md5($_POST['password'])."'"));

        if($row['usr'])
        {
            // If everything is OK login
            
            $_SESSION['usr']=$row['usr'];
            $_SESSION['id'] = $row['id'];
            $_SESSION['rememberMe'] = $_POST['rememberMe'];
            
            // Store some data in the session
            
            setcookie('tzRemember',$_POST['rememberMe']);
        }
        else $err[]='Wrong username and/or password!';
    }
    
    if($err)
    $_SESSION['msg']['login-err'] = implode('<br />',$err);
    // Save the error messages in the session

    header("Location: index.php");
    exit;
}
else if($_POST['submit']=='Register')
{
    // If the Register form has been submitted
    
    $err = array();
    
    if(strlen($_POST['username'])<4 || strlen($_POST['username'])>32)
    {
        $err[]='Your username must be between 3 and 32 characters!';
    }
    
    if(preg_match('/[^a-z0-9\-\_\.]+/i',$_POST['username']))
    {
        $err[]='Your username contains invalid characters!';
    }
    
    if(!checkEmail($_POST['email']))
    {
        $err[]='Your email is not valid!';
    }
    
    if(!count($err))
    {
        // If there are no errors
        
        $pass = substr(md5($_SERVER['REMOTE_ADDR'].microtime().rand(1,100000)),0,6);
        // Generate a random password
        
        $_POST['email'] = mysql_real_escape_string($_POST['email']);
        $_POST['username'] = mysql_real_escape_string($_POST['username']);
        // Escape the input data
        
        
        mysql_query("    INSERT INTO tz_members(usr,pass,email,regIP,dt)
                        VALUES(
                        
                            '".$_POST['username']."',
                            '".md5($pass)."',
                            '".$_POST['email']."',
                            '".$_SERVER['REMOTE_ADDR']."',
                            NOW()
                            
                        )");
        
        if(mysql_affected_rows($link)==1)
        {
            send_mail(    '[email protected]',
                        $_POST['email'],
                        'Registration System Demo - Your New Password',
                        'Your password is: '.$pass);

            $_SESSION['msg']['reg-success']='We sent you an email with your new password!';
        }
        else $err[]='This username is already taken!';
    }

    if(count($err))
    {
        $_SESSION['msg']['reg-err'] = implode('<br />',$err);
    }    
    
    header("Location: index.php");
    exit;
}

$script = '';

if($_SESSION['msg'])
{
    // The script below shows the sliding panel on page load
    
    $script = '
    <script type="text/javascript">
    
        $(function(){
        
            $("div#panel").show();
            $("#toggle a").toggle();
        });
    
    </script>';
    
}
?>