Recap - Organized Project

Let's build a complete blog application with proper namespace organization, bringing together everything you've learned about namespaces, the use keyword, and PSR-4 autoloading.

You'll create a well-structured project with five files that demonstrate how real PHP applications organize their code:

• src/Models/Author.php: Define an Author class in the Blog\Models namespace. It should have a public $name property, a constructor that accepts and sets the name, and a getBio() method that returns "Author: [name]".
• src/Models/Post.php: Define a Post class in the Blog\Models namespace. It should have public $title and public $author properties (where author is an Author object). The constructor accepts a title and an Author object, setting both. Add a getSummary() method that returns "[title] by [author name]".
• src/Services/Publisher.php: Define a Publisher class in the Blog\Services namespace. It should have a publish(Post $post) method that accepts a Post object and returns "Published: [post title]". You'll need to import the Post class using the use keyword since it's in a different namespace.
• vendor/autoload.php: Create a PSR-4 autoloader using spl_autoload_register that maps the Blog\ namespace prefix to the src/ directory. This single autoloader handles loading all your classes automatically.
• index.php: Your entry point. Require the autoloader, then use the use keyword to import Blog\Models\Author, Blog\Models\Post, and Blog\Services\Publisher. Create an Author named "Jane Smith", a Post with title "Getting Started with PHP" using that author, and a Publisher. Print the author's bio, the post's summary, and the result of publishing the post (each on its own line).

Notice how the Publisher service depends on the Post model. This demonstrates how classes in different namespaces can work together by importing what they need with use statements.