OOP database connect/disconnect class

Question

I have just started learning the concept of Object oriented programming and have put together a class for connecting to a database, selecting database and closing the databa

Answer 1

host         =   'localhost';
        $this->username     =   'root';
        $this->password     =   '';
        $this->database     =   'workclass';

        $this->link = mysqli_connect($this->host,$this->username,$this->password);

        $this->status = mysqli_select_db($this->link,$this->database);

        if (!$this->status) {
            return $this->status="Failed to Connected with Database";
        }else{
            return $this->status="Database is connected";
        }
    }
}

$object = new Database();

echo $object->status;

?>