my sample is good or not?
I have a good connection to the database, or too should be in the class?

Thanks

```
<?php
mysql_connect('localhost','root','admin');
mysql_select_db('test');

class UserDisplay
{
    function getDisplayName()
    {
        $sql = 'select first_name, last_name, display_name from users where user_id = "3"';
        $results = mysql_query($sql);
        $row = mysql_fetch_array($results);
        $this->user_id = $user_id;

        return $this->user_id;
    }
}

class UserInsert

    function InsertName($name)
    {
        mysql_query("INSERT INTO Persons (first_name)VALUES ('".$name."')");
    }
}

$userD = new UserDisplay();
echo "User known as: " . $userD->getDisplayName() . "\n";

$userI = new UserInsert();
$userI->InsertName("Peter");
?>

```