sfp_api_laravel_serprati/app/Http/Requests/CompanyBenefitRequest.php

<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;

class CompanyBenefitRequest extends FormRequest
{
    public function rules(): array
    {
        $rules = [
            'title'       => 'sometimes|string|max:255',
            'icon'        => 'sometimes|string|max:100',
            'description' => 'sometimes|nullable|string|max:500',
            'order'       => 'sometimes|integer|min:0',
        ];

        if ($this->isMethod('post')) {
            $rules['title'] = 'required|string|max:255';
            $rules['icon']  = 'required|string|max:100';
        }

        return $rules;
    }
}