multi step validation in laravel

SomeController.php

<?php 

public function someController(Request $request)
{
  // asumming ValidatesRequests trait in use we'll call $this->validate
  
  $this->validate($request, [
    // first set of rules
  ]);
  
  if ($request->has('some_field')) {
    $this->validate($request, [
      // conditional set of rules
    ]);
  }
  
  // good to go!
}