counts the number of stars based on like, unlike for PHP

CalculateStars.php

<?php
// ...
trait CalculateStars {
    /**
     * подсчитывает количество звезд на основе like, unlike
     * 
     * @param int $stars - количество звезд
     * @param int $round - округление по умолчанию до целого
     * @return float|int
     */
    public function calculateStars(int $stars = 5, $round = 0)
    {
        $likesTotal = (int)$this->count_like;    //  prop for yii2 model or other class
        $dislikeTotal = (int)$this->count_unlike;
        $total = $dislikeTotal + $likesTotal;
        if ($total === 0 || $stars === 0) {
            return 0;
        }
        $value = ($stars-($dislikeTotal/($likesTotal/$stars)));
        $rate = round($value, $round);
        return $rate >=0 ? $rate: 0;
    }
}