$_POST['username'] NOT defined?!

What's wrong? It can't define what stands in this title, and the textbox's name sent HAS the name username

PHP Code:

---

<?php
    include('config.php');
    // connect to the mysql database server.
    mysql_connect ($dbhost, $dbusername, $dbuserpass);
    mysql_select_db($dbname) or die('Cannot select database');
    if ( isset( $_COOKIE['SundhedU'] ) && isset( $_COOKIE['SundhedP'] ) )
    {
        header( "Location: main.php" );
    }
    else
    {
    if($_POST['username'] {
            //did they supply a password and username
            $username=$_POST['username'];
            $password=$_POST['password'];
            if ($password==NULL) { 
echo "<META HTTP-EQUIV='REFRESH' CONTENT='0;URL=index.php'>
";
}
            else
            {
                $query = mysql_query("SELECT username,password FROM users WHERE username = '$username'") or die(mysql_error());
                $data = mysql_fetch_array($query);
                if($data['password'] != md5($password))
                { 
echo "<META HTTP-EQUIV='REFRESH' CONTENT='0;URL=index.php'>";
}
                else
                {
                    if (isset($_POST['husklogin']))
                    {
                        setcookie('SundhedU', $username, time() + 3600 * 24 * 365);
                        setcookie('SundhedP', md5($password), time() + 3600 * 24 * 365);       
      
                        $query = mysql_query("SELECT username,password FROM users WHERE username = '$username'") or die(mysql_error());
                        $row = mysql_fetch_array($query);
                        $_SESSION["s_username"] = $row['username'];
                        header("Location: index.php");
                    }else{
                        $query = mysql_query("SELECT username,password FROM users WHERE username = '$username'") or die(mysql_error());
                        $row = mysql_fetch_array($query);
                        $_SESSION["s_username"] = $row['username'];
                        header("Location: index.php");
}
                }
            }
        }   
        }
?>

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shouldn't

PHP Code:

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 if($_POST['username'] { 


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be

PHP Code:

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 if(isset($_POST['username'])) { 


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As to do with the error message it means that you are trying to read a variable that has not been set. This is only a warning and does not affect your script, it will carry on as normal, you can change whether they are displayed or not via the php.ini file or by using error_reporting. But checking to seee if the variable has been set using isset() is much better.

Ok great! But the string

PHP Code:

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$username=$_POST['username']; 


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returns NULL

Can you post your form code?

PHP Code:

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<form method='post' action='check.php'>
              <left>Brugernavn 
              <input type='text' name='username'>
              <br>
              Kodeord 
              <input type='password' name='password'>           
              <input name='husklogin' type='checkbox' value='husklogin' checked>
              Husk mig&nbsp;&nbsp;
              <input name='submit' type='submit' value='Login'>
                <br>
              <br><center>
              <a href='opretbruger.php'>.: Opret bruger her :.</a><br>
              <a href='glemt.php'>.: Glemt login? :.</a></center></form> 


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You could try using print_r($_POST);

to see what is getting passed through

or you could try

echo $HTTP_POST_VARS['username'];

or $_REQUEST['username];

just a thought

Still kinda dead :/