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Extending and combining interfaces, guarantees that all methods from all interfaces will be available in an implementing class.
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I want to add another
requirement to the collection.
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The ability to return a short description.
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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.
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