$fail,$attribute,$value valid a rule in laravel code example

Example 1: laravel validate integer between

'item' => 'required|integer|between:1,10',

Example 2: laravel validation

/**
 * Bootstrap any application services.
 *
 * @return void
 */
public function boot()
{
    Validator::extend(...);

    Validator::replacer('foo', function ($message, $attribute, $rule, $parameters) {
        return str_replace(...);
    });
}