No output / project file updates out of order

<?php
include "/Users/Jeff/Sites/classes/recipes.php";
include "/Users/Jeff/Sites/classes/render.php";
include "/Users/Jeff/Sites/inc/recipecollection.php";
include "/Users/Jeff/Sites/inc/recipes.php";

 $cookbook = new recipeCollection('Recipe Collection 1');
 $cookbook->addRecipe($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($cookbook->getRecipeTitles());
//echo Render::displayRecipe($belgian_waffles);



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) {

        $this->recipe=$recipe;
    }

    public function getRecipes() {

        return $this->recipes;
    }

    public function getRecipeTitles() {

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

    return $titles; 
} }




class Recipe
{
    private $title;
    public $ingredients = array();
    public $instructions = array();
    public $yield;
    public $tag = array();
    public $source = "Alena Holligan";

    private $measurement = array (
      "tsp",
      "tbsp",
      "cup",
      "cups",
      "oz",
      "lb",
      "fl oz",
      "pint",
      "quart",
      "gallon"  
    );

    public function __construct($title = null){

        $this->setTitle($title);
    }

    public function __toString(){

        $output = " you are calling a " . __CLASS__ . " object with the title \"";
        $output .= $this->getTitle() . "\"";
        $output .= "</br>"." It is stored in " . basename(__FILE__) . " at " . __DIR__ . ".";
        $output .= "</br>"."This display is from the line " . __LINE__ ." in method " . __METHOD__;
        $output .= "</br>"."The following method are available for object of this class:"."</br>";
        $output .= implode("</br>", get_class_methods( __CLASS__));
        return $output;
   }

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

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

    public function setYield($yield) {

       $this->yield = $yield;
    }

    public function getYield() {

       return $this->yield;
    }

    public function setSource($source) {

        $this->source = $source;
    }

    public function getSource() {

       return $this->source;
    }

    public function addIngredient($item, $amount = null, $measure = null){

        if($amount != null && !is_float($amount) && !is_int($amount)){
            exit("the amount must be a float or int: ".gettype($amount)." $amount given");
        }

        if($measure != null && !in_array(strtolower($measure), $this->measurement)){
            var_dump($measure);
         exit("please enter a valid measurement: ". implode(", " ,$this->measurement). " are acceptable.");   
        }
        $this->ingredients[] = array(
            "item" => ucwords($item),
            "amount" => $amount,
            "measure" => strtolower($measure)
        );
    }

    public function getIngredients() {

       return $this->ingredients;
    }

    public function addInstruction($string) {

       $this->instructions[] = $string;
    } 

    public function getInstructions() {

       return $this->instructions;
    }    

    public function addTag($tag) {

       $this->tags[] = strtolower($tag);
    }   

    public function getTags() {

       return $this->tags;
    }  }


class Render {  

 public function __toString() {

        $output .= "</br>"."The following methods are available for ". __CLASS__ ." objects:"."</br>";
        $output .= implode("</br>", get_class_methods( __CLASS__));
        return $output;
   }


public static function listIngredients($ingredients) {

 $output = "";

 foreach($ingredients as $ing) {
         $output .= $ing["amount"] . " " . $ing["measure"] . " " . $ing["item"];
         $output .= "</br>"; 
    }
    return $output;
    }   

public static function displayRecipe($recipe) {   

     $output = "";
     $output .= $recipe->getTitle() . " by " . $recipe->getSource();      
     $output .= "</br>";
     $output .= implode(", ", $recipe->getTags());
     $output .= "</br>";
     $output .= self::listIngredients($recipe->getIngredients());
     $output .= "</br>";
     $output .= implode("</br>", $recipe->getInstructions());


         return $output;

     }

public static function listRecipes($titles) {

asort($titles); 
return implode("</br>", $titles);

}  }  ?>



Please advise! Thanks!