What are the Differences Between "php artisan dump-autoload" and "composer dump-autoload"?

I am pretty new to Laravel 4 and Composer. While I do Laravel 4 tutorials, I couldn't understand the difference between those two commands; php artisan dump-autoload and composer dump-autoload What's the difference between them?

Laravel's Autoload is a bit different:

1. It will in fact use Composer for some stuff

2. It will call Composer with the optimize flag

3. It will 'recompile' loads of files creating the huge bootstrap/compiled.php

4. And also will find all of your Workbench packages and composer dump-autoload them, one by one.

php artisan dump-autoload was deprecated on Laravel 5, so you need to use composer dump-autoload