$user_check = $_SESSION['login_user'];
$password = $_SESSION['login_pass'];
$type = $_SESSION['login_type'];

$ses_sql=mysql_query("select * from users_tbl where username='$user_check' AND password='$password' AND type='$type'", $connection);
$row = mysql_fetch_assoc($ses_sql);

$login_session =$row['username'];
if(!isset($login_session))
{
    mysql_close($connection);
    header('Location: login.php');
}