PostRepository.php

<?php
namespace Blog\Model;

class PostRepository implements PostRepositoryInterface
{
    /**
     * {@inheritDoc}
     */

    private $data = [
            1 => [
                    'id'    => 1,
                    'title' => 'Hello World #1',
                    'text'  => 'This is our first blog post!',
            ],
            2 => [
                    'id'     => 2,
                    'title' => 'Hello World #2',
                    'text'  => 'This is our second blog post!',
            ],
            3 => [
                    'id'     => 3,
                    'title' => 'Hello World #3',
                    'text'  => 'This is our third blog post!',
            ],
            4 => [
                    'id'     => 4,
                    'title' => 'Hello World #4',
                    'text'  => 'This is our fourth blog post!',
            ],
            5 => [
                    'id'     => 5,
                    'title' => 'Hello World #5',
                    'text'  => 'This is our fifth blog post!',
            ],
    ];

    public function findAllPosts()
    {
        return array_map(function ($post) {
            return new Post(
                $post['title'],
                $post['text'],
                $post['id']
            );
        }, $this->data);
    }

    /**
     * {@inheritDoc}
     */
    public function findPost($id)
    {
        if (! isset($this->data[$id])) {
            throw new DomainException(sprintf('Post by id "%s" not found', $id));
        }

        return new Post(
                $this->data[$id]['title'],
                $this->data[$id]['text'],
                $this->data[$id]['id']
        );
        }
    }