[PHP] Using Nullable Return Types in PHP

00-post.php

<?php

namespace Acme;

class Post {
  // Attributes, Constructor, and Functions here.
}

01-postmanager.php

<?php

namespace Acme;

class PostManager {
  
  private $post;
  
  // Constructor and other Functions here.
  
  public function getPost(): Post
  {
    return $this->post;
  }
  
}

02-postmanager.php

<?php

namespace Acme;

class PostManager {
  
  private $post;
  
  // Constructor and other Functions here.
  
  public function getPost(): ?Post
  {
    if ($this->post === null) {
      return null;
    }
    
    return $this->post;
  }
}