如果用户是admin PHP，则仅回显

I'm currently trying to learn PHP, which is difficult. I'm trying to make my own login system (CMS), however I'm encountering some problems during this process. I have been able to create a login script which is working for now, it's not a safe script I know, but it's just for me to learn the process.

I have added in phpmyadmin a new row which indicates what role the user have (1 or 2), 1 is user and 2 is admin. However I have no idea where to start. I assume it should be something like: if user == however I don't know how to start. Could someone help me a little bit?

I want to create something like the:

Normal user: - Home - Invoices - Contact

Admin: - Home - Invoices - admin - Contact

My script so far:

        <?php
    session_start();
    // Verbinding maken met database
    require("db.php");

    // Functions na klikken 'inloggen'

    if (isset($_POST["login"])){ 
        $gebruikersnaam = mysqli_real_escape_string($con, $_POST['gebruikersnaam']);
        $wachtwoord = mysqli_real_escape_string($con, $_POST['wachtwoord']);
        $selecteergebruiker = "SELECT * FROM gebruikers WHERE username ='$gebruikersnaam' AND password = '$wachtwoord'";
        $run_user = mysqli_query($con, $selecteergebruiker);
        $check_user = mysqli_num_rows($run_user);
        if($check_user>0){
            header('location: home.php');
        } else { 
        echo "Onjuist!";
        }
    }
?>

Here is some hint you can start with....

if($check_user>0){
     while($row=mysqli_fetch_array($selecteergebruiker))
      { 
         session_start();
         if($row['role']==1)//user is admin
         { 
           $_SESSION['role']='Admin';
         }
         else
         {
           $_SESSION['role']='User';
         }
      }
       header('location: home.php');
        } else { 
   echo "Onjuist!";
   }

Now in other page you can use $_SESSION['role']; thats it..

Add a column to the sql table called role Set admin role to admin and other users touser than check what's the user role with an if statement

if ( $user['role'] == admin ) {
     Echo "Hello admin";
} else { 
     Echo "Hi user....";
}