PHP POO example

0_main.php

<?php

$post = new Post();
$post->setTitle('Awesome title');
$post->setContent('My very awesome article');


$comment = new Comment();
$comment->setAuthor('Alice');
$comment->setText('That\'s a very great article!');
$post->addComment($comment);

Comment.php

<?php

class Comment
{
    protected $post;
    protected $author;
    protected $text;

    public function getAuthor()
    {
        return $this->author;
    }
    
    public function setAuthor($author)
    {
        $this->author = $author;

        return $this;
    }

    public function getText()
    {
        return $this->text;
    }
    
    public function setText($text)
    {
        $this->text = $text;

        return $this;
    }

    public function getPost()
    {
        return $this->post;
    }
    
    public function setPost(Post $post)
    {
        $this->post = $post;

        return $this;
    }
}

Post.php

<?php

class Post
{
    protected $title;
    protected $content;
    protected $comments;
    
    public function __construct()
    {
        $this->comments = array();
    }
    
    public function getTitle()
    {
        return $this->title;
    }
    
    public function setTitle($title)
    {
        $this->title = $title;

        return $this;
    }
    
    public function getContent()
    {
        return $this->content;
    }
    
    public function setContent($content)
    {
        $this->content = $content;
        
        return $this;
    }
    
    public function getComments()
    {
        return $this->comments;
    }
    
    public function addComment(Comment $comment)
    {
        $comment->setPost($post);
        $this->comments[] = $comment;

        return $this;
    }
    
    public function removeComment(Comment $comment)
    {
        if(($key = array_search($comment, $this->comments)) !== false) {
            unset($this->comments[$key]);
        }
        
        return $this;
    }
}