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I want to add another
requirement to the collection.

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The ability to return a short description.

3
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Instead of implementing another interface
I'm going to combine all of these

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requirements into a single
collection interface.

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This will allow us to be certain that
any class that implements a collection

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interface will have all the iterator and
countable methods,

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as well as the new method we'll define.

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Add a new file to the source
interface's folder.

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We'll name this CollectionInterface.php.

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Interface CollectionInterface.

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We'll define our new interface
by adding the keyword extends.

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To extend the Iterator and
Countable interfaces.

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Note that this is very similar to how
classes can extend other classes.

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However, we can extend
more than one interface.

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Now we can add our new method,
public function shortDescription.

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By extending the iterator and countable
interfaces our CollectionInterface

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will now include all of the methods
defined in those interfaces.

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This means that anyone implementing our
CollectionInterface will also need to

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implement the methods from the Iterator
and Countable interfaces as well.

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Back in our Collection class.

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Let's change this to CollectionInterface.

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Now we need to define
the short description,

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public function shortDescription.

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We are going to use
the current item details.

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First, we're going to check if

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the strlen($this->current()->details)

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Is less than 510, then we're

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going to return the current details.

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But we're going to strip the tags.

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This current- Details.

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If we make it past the early return,

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we're going to return our
trimmed down version,

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return, and
again we'll start with strip_tags.

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I'm going to add some line spacing
to make this easier to read.

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Substring this

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current details.

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We're going to start at our
first character, which is 0.

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And then find the string
position In this current details.

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And we're going to look for
the first space after 500 characters.

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The final touch is to add an ellipses or

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triple dots at the end to identify
that there's more to this description.

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We'll just use dot, dot, dot.

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We're finally ready to include our list
view with the post which will give us

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a sample of each post.

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Let's add a new view.

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In the views folder, new file list.php.

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The first thing I'm going to do is check
if the item status is equal to published.

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Next we'll create an article
block with a title.

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We'll add the $item,
title, and closer tag.

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Finally we can use our short description.

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Since the collection handles
the short description and

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not the item itself, we use content.

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So echo $content->shortDescription.

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Since we've stripped tags,

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let's add a paragraph tag
surrounding the short description.

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Now we can add this to our index page.

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In the for each loop,
instead of just the title

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we're going to include 'views/list.php.

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Let's take a look at this in the browser.

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It's starting to look like a blog.

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Let's add the ability to read each
of these posts in its entirety.