Add non composer PHP packages to Laravel

On the rare occasion you need to add a library of code that is not setup for Composer, then follow the X steps below:

1. Download a library e.g Matex PHP Mathematical expression parser and evaluator
2. Copy the library to a project root folder e.g lib
3. Add the path to the library code to your composer.json as follows:

   "autoload": {
     "classmap": [
        "database/seeds",
        "database/factories",
        "lib/matex/Matex"
     ],
     "psr-4": {
       "App\\": "app/"
     }
   },

4. Now run composer dump-autoload
5. Add use command to your PHP class e.g. use Matex\Evaluator;

Now you can use your library throughout your Laravel build.