Domain-Driven Design in PHP

SQL Implementation

In a classic example, we could create a simple PDO implementation for our PostRepository just by using plain SQL queries:

namespace Infrastructure\Persistence\Sql;use Domain\Model\Body;use Domain\Model\Post;use Domain\Model\PostId;use Domain\Model\PostRepository;class SqlPostRepository implements PostRepository{    const DATE_FORMAT = 'Y-m-d H:i:s';    private $pdo;    public function __construct(\PDO $pdo)    {        $this->pdo = $pdo;    }    public function save(Post $aPost)    {        $sql ='INSERT INTO posts ' .            '(id, body, created_at) VALUES ' .            '(:id, :body, :created_at)';        $this->execute($sql, [            'id' => $aPost->id()->id(),            'body' => $aPost->body()->content(),            'created_at' => $aPost->createdAt()->format(                self::DATE_FORMAT            )        ]);    } private function ...