gistfile1.txt

	

    class Entity
    {
      protected $model;
      
      protected function initModel() {
        $this->model = [];
      }
      
      public function __construct() {
        $this->initModel();
      }
    }
     
    class Cat extends Entity
    {
      protected $unique = 
        [
                'cry'=>'meow',
                'food'=>'meat'
        ];

      protected function initModel() {
        parent::initModel();
        $this->model = array_merge($this->unique, $this->model);
      }
    }
     
    class Tiger extends Cat
    {
      protected $new_stuff =
                    [
                            'cry'=>'roar',
                            'ability'=>'pounce'
                    ];
      protected function initModel() {
        parent::initModel();
        $this->model = array_merge($this->new_stuff, $this->model);
      }
    }
     
    class Sabertooth extends Tiger
    {
    }
     
    class Chimera extends Sabertooth
    {
        protected $shiny_stuff =
                        [
                            'ability'=>'fly',
                            'food'=>'heroes'
                    ];
        protected function initModel() {
          parent::initModel();
          $this->model = array_merge($this->shiny_stuff, $this->model);
        }
    }

$cat = new Cat;
$tiger = new Tiger;
$chimera = new Chimera;

var_dump($cat);
var_dump($tiger);
var_dump($chimera);