Add star reviews to your posts programatically

<?php
//Helper function check if value is int or float
function is_decimal($val){

        return is_numeric( $val ) && floor( $val ) != $val;
    }

if ( !function_exists('my_stars_rating')){
    function my_stars_rating( $content ){
        global $post;

        $stars_count = get_post_meta($post->ID,'total_score', true);
        if ($stars_count){
            ob_start() ?>
            <h3 class="ctr-title"><?php printf( __('The rating for this post is %s', 'textdomain'), $stars_count );?></h3>
            <ul class="ctr-stars-list">
                <?php
                if ( is_decimal($stars_count) ){
                    for ($i = 1; $i <= ($stars_count); $i++){

                        echo '<li class="ctr-star"><i class="fas fa-star" aria-hidden="true"></i></li>';

                    }

                    echo '<li class="ctr-star"><i class="fas fa-star-half" aria-hidden="true"></i></li>';

                } else {
                    for ($i = 1; $i <= $stars_count; $i++){

                        echo '<li class="ctr-star"><i class="fas fa-star" aria-hidden="true"></i></li>';

                    }
                }
                ?>
            </ul>
            <?php
            return ob_get_clean();
        }
        if ( is_single() ){
            return $content.$stars_count;
        }
    }

}


add_filter('the_content', 'my_stars_rating');