PHP Visibility by Example

php-visibility

<?php

namespace PrivateExample {

  class Animal {
    private $innermostFeelings = "HUNGER";
    public function __construct() {
      echo "Animal feels $this->innermostFeelings\n";
    }
    public function empathy(Animal $other) {
      echo "The other animal feels $other->innermostFeelings\n";
    }
  }

  $animal = new Animal;

  class Shawn extends Animal {
    public function __construct() {
      echo "Shawn feels $this->innermostFeelings\n";
    }
  }

  $shawn = new Shawn;

  $other = new Animal;

  $other->empathy($animal);
}

namespace ProtectedExample {

  class Animal {
    protected $innermostFeelings = "HUNGER";
    public function __construct() {
      echo "Animal feels $this->innermostFeelings\n";
    }
    public function empathy(Animal $other) {
      echo "The other animal feels $other->innermostFeelings\n";
    }
  }

  $animal = new Animal;

  class Shawn extends Animal {
    public function __construct() {
      echo "Shawn feels $this->innermostFeelings\n";
    }
  }

  $shawn = new Shawn;

  $other = new Animal;

  $other->empathy($animal);
}