Building RESTful Web Services with PHP 7

/api/posts with the POST method

This will trigger the PostController::store() method. The thing we have missed is validation. In fact, Lumen provides us validation support as well as some built-in validation rules. Lumen validation is very similar to Laravel, with some differences. I would suggest that you have a look at Laravel's validation documentation, at https://laravel.com/docs/5.4/validation, and Lumen's validation differences with Laravel: https://lumen.laravel.com/docs/5.4/validation.

Here, we have added validation in store(), so look at the code after adding validation and we will then discuss it:

public function store(Request $request){    $input = $request->all();    $validationRules = [        'content' => 'required|min:1', 'title' => 'required|min:1', ...