php登录：未定义索引[关闭]

Question

Im very new to php and this is my first go on on this login. so when im typing in a valid username and password from the database im getting these two errors:

Notice: Undefined index: brukernavn on line 3

Notice: undefined index: passord on line 4

$username = $_POST['brukernavn'];
$password = $_POST['passord'];

if($username&&$password)
{

$connect = mysql_connect("localhost", "root", "") or die ("Cannot connect");
mysql_select_db("prosjekt") or die ("Cant find db");

$query = mysql_query("SELECT * FROM bruker WHERE brukernavn='$username'");

$radnum = mysql_num_rows($query);

if ($radnum!=0)
{

while ($rad = mysql_fetch_assoc($query))
{
    $dbuser = $rad['brukernavn'];
    $dbpass = $rad['passord'];
}

if ($username==$dbuser&&$password==$dbpass)
{
echo "Logged in";
}
else
    echo "Wrong username or password";

}
else
    die("That user does not exist!");


}
else
    die("Please enter a username and password!");




?>

Could anyone see where i went wrong here?

Answer 1

You're trying to access two variables that haven't been assigned yet:

$username = $_POST['brukernavn'];
$password = $_POST['passord'];

You either:

1. Need to wrap your login code in an if statement to check to see if the form has been submitted

2. Need to check to see if those variables are set before accessing their values