<?php
namespace app\components\validators;

use yii\validators\Validator;

class PercentageValidator extends Validator
{
    public function validateAttribute($model, $attribute)
    {
        $percentage = $model->{$attribute};

        if (!is_null($percentage) && ($percentage < 0 || $percentage > 100)) {
            $model->addError($attribute, 'Should be a value between 0 and 100.');
        }
    }
}