Validation Rule with Some Conditions

If your validation rules depend on some condition, you can modify the rules by adding withValidator() to your FormRequest class, and specify your custom logic there. Like, if you want to add validation rule only for some user role.

use Illuminate\Validation\Validator;
class StoreBlogCategoryRequest extends FormRequest {
    public function withValidator(Validator $validator) {
        if (auth()->user()->is_admin) {
            $validator->addRules(['some_secret_password' => 'required']);
        }
    }
}