hi i wrote a code to create login page but it show this error
"Notice: Use of undefined constant id - assumed 'id' in C:\xampp\htdocs\login.php on line 41
Notice: Use of undefined constant level - assumed 'level' in C:\xampp\htdocs\login.php on line 42
chao ban ". CAN SOME ONE FIX THIS FOR ME? this is my code
1.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
<body>
<form action='login.php' method='post'>
Username: <input type='text' name='username' size='25' /><br />
Password: <input type='password' name='password' size='25' /><br />
<input type='submit' name='ok' value='Dang Nhap' />
</form>
</body>
</html>
2.<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
<?php
if(isset($_POST['ok']))
{
$u=$p="";
if($_POST['username'] == NULL)
{
echo "Please enter your username<br />";
}
else
{
$u=$_POST['username'];
}
if($_POST['password'] == NULL)
{
echo "Please enter your password<br />";
}
else
{
$p=$_POST['password'];
}
if($u && $p)
{
$conn=mysql_connect("localhost","root","123456") or die("can't connect this database");
mysql_select_db("tuan",$conn);
$sql="select * from users where username='".$u."' and password='".$p."'";
$query=mysql_query($sql);
if(mysql_num_rows($query) == 0)
{
echo "Username or password is not correct, please try again";
}
else
{
$row=mysql_fetch_array($query);
session_start();
$_SESSION['userid'] = $row[id];
$_SESSION['level'] = $row[level];
echo "chao ban";
}
}
}
?>
<body>
</body>
</html>
