Add a star review system on a php based page

functions.php

    <?php
    /**
     * Generates the star rating based on the number of reviews.
     *
     * @param int $reviews The number of reviews to calculate the star rating.
     * @return string The HTML representation of the star rating.
     */
    function stars( $reviews )
    {   
        $stars = '';
        $stars .= '<div class="addsell-star">';
        for ($i = 0; $i < 5; $i++) {
            if ($i < $reviews && $reviews - $i >= 1) { 
                $stars .= '<span class="dashicons dashicons-star-filled"></span>';
            } elseif ($i< $reviews && $reviews - $i < 1) {
                $stars .= '<span class="dashicons dashicons-star-half"></span>';
            } else {
                $stars .= '<span class="dashicons dashicons-star-empty"></span>';
            }
        }
        $stars .= '</div>';
        return $stars;
    }