I'm not sure if that's all all of your code but you must session_start() before you can access $_SESSION

Your code only queries unless a post isn't set so change it:

if (isset($_POST['submit'])) {

  //your code

}

Also, be sure to escape user input to prevent sql injection:

$user_username = mysql_real_escape_string($_POST['username']);

Make sure it's not a error in your SQL:

echo mysqli_error($dbc);

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You are not executing anything the because of this line:

if (!isset($_POST['submit'])) {

It should be change to

if (isset($_POST['submit'])) {

isset() will return TRUE if that variable is set. !isset() will return TRUE if it is not set

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I see two problems:

Your boolean is backwards on the line (i.e. remove the ! mark)

if (!isset($_POST['submit'])) {

The second problem is that your input button lacks a name="submit" attribute, so it is never being passed, so the variable will never be present regardless of the first problem.

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Thank you everyone, got it working.

<?
//Start session
session_start();

$_SESSION['message'] = "";

//Include database connection details
require_once('global.php');


//Connect to mysql server
$link = mysql_connect(DB_HOST, DB_USER, DB_PASSWORD);
if(!$link) {
    die('Failed to connect to server: ' . mysql_error());
}

//Select database
$db = mysql_select_db(DB_DATABASE);
if(!$db) {
    die("Unable to select database");
}

if(!empty($login) && !empty($password)) {

    $login = mysql_real_escape_string($_POST['login']);
    $password = mysql_real_escape_string($_POST['password']);

    $query = "SELECT * FROM tuser WHERE username = '$login' AND password = SHA('$password')";
    $data = mysql_query($query);

    if($data) {
        if (mysql_num_rows($data) == 1 ) {
            $row = mysql_fetch_assoc($data);
            $_SESSION['userid'] = $row['userid'];
            $_SESSION['username'] = $row['username'];
            $_SESSION['message'] = "Welcome,&nbsp;" . $_SESSION['username'];
            header('Location: member.php');
            exit();
        }
        else {
            $_SESSION['message'] = "Please enter a valid username or password";
            header('Location: error.php');
            exit();
        }

    }
    else {
        die("Query failed");
    }

}
else {
    $_SESSION['message'] = "Please enter a username or password";
    header('Location: error.php');
    exit();
}


?>

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Comments

• Start SQL injection comments... now...!
• Try to echo the username and password before you initialize the connection to the database. to determine if you code actually entered your if statement. since i am having some second thoughts on your $_POST['submit']. seems to be wrong.
• Oh I agree, indenting your code so it's readable is totally overrated.
• your submit should be if (isset($_POST['submit']))...start there
• @Ronnie You mean you think he should actually execute some code? Radical idea, I'm not sure if that will catch on...
• It's actually session_start :P