abstract class Database {
  abstract public function connection();

  protected $server = "54.215.23.228";
  protected $database = "db-west-03";
  protected $user = "bigcheese";
  protected $pass = "4G_8*-21Rt7";

  public function disconnect() {
    // disconnect from server
  }

}


class Mysql extends Database {

  public $connection = "open";

  public function connection() {

    echo "PARAMS:<br>Server: " . $this->server . "<br>\n";
    echo "Database: " . $this->database . "<br>\n";
    echo "User: " . $this->user . "<br>\n";
    echo "Pass: " . $this->pass . "<br>\n";

  }

  public function disconnect() {
    // disconnect from server
    $this->connection = "closed";
  }

}

// YOU NEVER WANT TO INSTANTIATE AN ABSTRACT CLASS
//$db = new Database();

$mysql = new Mysql();
$mysql->connection();
$mysql->disconnect();
echo "Connection: " . $mysql->connection;