Flatten data objects

flat.php

<?php

class PostContentData {
  public function __construct(
    public string $excerpt,
    public string $content,
  ) {}
}

class SettingsData {
  public function __construct(
     public string $name,
     public string $title,
     public PostContentData $post,
  )
  {}
}

/*
 * Given the following objects, calling the `toArray()` method will produce this array:
 */
[
  'name' => 'John',
  'title' => 'The Hero',
  'post' => [
      'excerpt' => 'Story summary',
      'content' => 'A long time ago...'
  ],
]

/*
 * I would have liked a native method to flatten the transformed data where for each nested data objects, 
 * we only get their properties like so, putting them all at the same level:
 */
[
  'name' => 'John',
  'title' => 'The Hero',
  'excerpt' => 'Story summary',
  'content' => 'A long time ago...'
]