<?php
include "classes/recipes.php";
include "classes/render.php";
include "classes/recipecollection.php";
include "inc/allrecipes.php";

$cookbook = new RecipeCollection("Treehouse Recipes");
$cookbook->addRecipe("$lemon_chicken");
$cookbook->addRecipe("$granola_muffins");
$cookbook->addRecipe("$belgian_waffles");
$cookbook->addRecipe("$pepper_casserole");
$cookbook->addRecipe("$lasagna");
$cookbook->addRecipe("$dried_mushroom_ragout");
$cookbook->addRecipe("$rabbit_catalan");
$cookbook->addRecipe("$grilled_salmon_with_fennel");
$cookbook->addRecipe("$pistachio_duck");
$cookbook->addRecipe("$chili_pork");
$cookbook->addRecipe("$crab_cakes");
$cookbook->addRecipe("$beef_medallions");
$cookbook->addRecipe("$silver_dollar_cakes");
$cookbook->addRecipe("$french_toast");
$cookbook->addRecipe("$corn_beef_hash");
$cookbook->addRecipe("$granola");
$cookbook->addRecipe("$spicy_omelette");
$cookbook->addRecipe("$scones");
echo Render::listRecipes($cookbook->getRecipeTitles());

<?php

class RecipeCollection
{
  private $title;
  private $recipes = array();

  public function __construct($title = NULL) 
  {
      $this->setTitle($title);
  }

  public function setTitle($title)
  {
      if (empty($title)) {
          $this->title = NULL;
      } else {
          $this->title = ucwords($title);
      }
  }

  public function getTitle() 
  {
      return $this->title;
  }

  public function addRecipe($recipe)
  {
      $this->recipes[] = $recipe;
  }

  public function getRecipes()
  {
      return $this->recipes;
  }

  public function getRecipeTitles()
  {
      $titles = array();
      foreach ($this->recipes as $recipe) {
          $titles[] = $recipe->getTitle();
      }
      return $titles;
  }
}