Move the C&S thing into the attic

oldstuff/c&s20150725/inheritance.php

@@ -0,0 +1,52 @@
+<?php
+
+class Pet {
+  public $name;
+  public $isRunning = false;
+
+  private function __construct()
+  {}
+
+  public static function create($name)
+  {
+    $newPet = new static;
+    $newPet->name = $name;
+    return $newPet;
+  }
+
+  public function run()
+  {
+    $this->isRunning = true;
+    return $this->name . ' is running';
+  }
+}
+
+class Dog extends Pet {
+  protected $currentChaseTarget;
+
+  public function chase(Pet $chaseTarget)
+  {
+    $this->isRunning = true;
+    $this->currentChaseTarget = $chaseTarget;
+    $this->currentChaseTarget->run();
+
+    return $this->name . ' is chasing ' . $chaseTarget->name;
+  }
+}
+
+$cat = Pet::create('Felix');
+
+var_dump($cat);
+
+$cat->run();
+
+var_dump($cat);
+
+$dog = Dog::create('Fido');
+
+var_dump($dog);
+
+var_dump($dog->chase($cat));
+
+var_dump($dog);
+var_dump($cat);