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Object-Oriented PHP Basics

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Enhancing the Collection

3:30 with Alena Holligan

We have a basic structure for our collection object, but it's not really doing any more than getting and setting an array, so let's start enhancing our collection by pulling specific information from the objects.

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    We're using a collection object, instead of an array, because we want to have more 0:00
    control and keep the functionality of our cookbook grouped together with the data. 0:04
    So what are these extra features that our cookbook brings to the party. 0:09
    First off, we want to be able to get a list of the recipe titles. 0:13
    There are actually two parts to this action, grabbing the titles and 0:18
    displaying the list. 0:22
    These are two very separate responsibilities, grabbing the data, and 0:24
    displaying the data. 0:28
    In the last stage, we talked about the Single Responsibility Principle, and 0:29
    we set up a new render class. 0:34
    The render class controls how something is shown, and 0:36
    can change based on where we're using the data. 0:40
    In this course, we're displaying everything to the console, but 0:43
    we could render our recipes to a website or data feed. 0:47
    No matter how or where we render this data, the data remains the same. 0:51
    Let's set up two methods. 0:57
    One in our collection class to grab the titles, and 0:59
    one in the render class to display these titles in a list. 1:03
    Let's start in our recipe collection, where we need to get the recipe titles. 1:08
    Let's create a new method. 1:13
    We'll name this getRecipeTitles(). 1:18
    Since each of the recipes is an object that contains much more than just 1:27
    the title, we need to grab just the title. 1:31
    We'll start by initializing our title's array. 1:35
    Then we'll loop through each of the recipes in the collection and 1:39
    grab the title. 1:43
    To our title's array, we add $recipe getTitle():. 1:54
    Then we can return our titles. 2:02
    Now we can go into our render class to display the list. 2:07
    We'll call this listRecipes, and we'll pass in the titles. 2:18
    Before we display the recipes, I think we should sort the titles. 2:28
    We can use asort to sort the values in the titles array. 2:33
    Finally, we want to return a list of titles. 2:40
    So we'll use the implode function again. 2:42
    Let's go back to our cookbook file and try this out. 2:55
    Instead of our var_dump, let's use our Render. 3:01
    Then we'll pass it our getRecipesTitles(). 3:13
    Now let's run this script. 3:21
    Great, now we see a list of recipe titles in alphabetical order. 3:26

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