Idea: Uses PHP traits for a class from another file

example.php

<?php


// In /index.php
spl_autoload_register(fn($c) => require sprintf( "%s/src/%s.php", __DIR__, $c ));

// In /src/FooBarCms.php
class FooBarCms {}


// In /plugins/my-map/src/MyMap.php
class MyMap {
  function display() {}
}

// In /plugins/my-map/src/MyMapper.php
trait MyMapper {
  public $map;
  function __construct() {
    $this->map = new MyMap;
  }
}

// In /plugins/my-map/index.php
spl_autoload_register(fn($c) => require sprintf( "%s/src/%s.php", __DIR__, $c ));
register_dynamic_trait( FooBarCMS::class, MyMapper::class, fn($instance) => $instance->map = new MyMap );
$cms = new FooBarCms();
$cms->map->display();