Dynamic Form Validation in Laravel

FooController.php

<?php

namespace App\Http\Controllers;

use App\Http\Requests\FooRequest;
class BudgetController extends Controller
{
  
  // ...
  
    public function makeFoo(FooRequest $request)
    {
        // Do wonderful Stuffs
    }
  
  // ...

FooRequest.php

<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Support\Facades\Auth;

class FooRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        return true;
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
    	$optionalRules = [
		    'name'      => 'required|string|max:255',
		    'email'     => 'required|string|email|max:255|unique:users',
		    'password'  => 'required|string|min:6|confirmed',
	    ];

        $requiredRules = [
	        'location'               => 'required',
	        'business_category'      => 'required',
            	'phone'                  => 'required',
            	'business_name'          => 'required|string|max:255',
        ];

        return !Auth::check() ? array_merge($optionalRules, $requiredRules) : $requiredRules;
    }

    public function messages() {
	    return [
	    	'name.required'             	=>      'Please input your name.',
	    	'email.required'            	=>      'Please input your email.',
	    	'email.unique'              	=>      'The email has already been taken. Choose another.',
	    	'password.required'         	=>      'Please input your password.',
	    	'password.min'              	=>      'Password should not be less than 6 characters.',
	    	'password.confirmed'        	=>      "Passwords doesn't match.",
	    	'location.required'         	=>      "Please input your location",
	    	'business_name.required'    	=>      "Please input your business_name",
	    	'business_category.required'	=>      "Please input your business_category",
	    	'phone.required'            	=>      "Please input your phoneNumber",
	    ];
    }
}