gistfile1.txt

# Plugin Autoloader

do_action('plugin_autoloader');

# Plugin B

add_action( 'plugin_autoloader', 'loadStuff' );

function loadStuff(){
  require_once 'class.dostuff.php';
  require_once 'class.domorestuff.php';
}

# class.dostuff.php

Class DoStuff {
  
  __construct(){
    # do stuff, or not
  }
  
  private function private_stuff(){
    # do private stuff
  }

}

# class.domorestuff.php

Class DoMoreStuff {
  
  __construct(){
    # do stuff, or not
  }
  
  private function private_stuff(){
    # do private stuff
  }

}