class User extends DataObject { public function __construct($id = null) { parent::__construct($id, 'users'); } }
class Message extends DataObject { public $table = 'message'; public function __construct($id = null) { if (!$this->table) { $this->table = 'messages'; } parent::__construct($id, $this->table); } }This example defines a new class called Message that extends the DataObject class. The constructor function takes an optional parameter called $id, which is used to specify the ID of the message. If the table property is not set, the message table is used. Otherwise, the table specified in the $table property is used. The package library used for this example is likely to be a PHP framework or library that provides a database abstraction layer. Some possible packages include Laravel, CodeIgniter, or Zend Framework.