Update php code in function.php

Hi, a have php scripts. In updates it is not working. How I updates script to working in newest plugin?

if (!function_exists('get_most_viewedDen')) {

        function get_most_viewedDen($mode = '', $limit = 16, $chars = 0, $display = true) {

            $start_date = mktime(date("H"), date("i"), date("s"), date("m"), date("d") - 3, date("Y"));
            $cil_date = mktime(date("H"), date("i"), date("s"), date("m"), date("d"), date("Y"));
            echo "<small><strong>";
			echo date_i18n("j.n.y G:i",time()-(60*60*24*3));
			echo " - ";
			echo date_i18n("j.n.y G:i");
			echo "</strong></small><br>";
            echo "<ul>";
//            echo "Aktualizace: " . date_i18n("d.m.Y G:i:s");
            global $wpdb, $post;
            $views_options = get_option('views_options');
            $where = '';
            $temp = '';
            $output = '';
            if (!empty($mode) && $mode != 'both') {
                $where = "post_type = '$mode'";
            } else {
                $where = '1=1';
            }

            $date_limit = "post_date BETWEEN '" . date("Y-m-d H:i:s", $start_date) . "' AND '" . date("Y-m-d H:i:s", $cil_date) . "'";

            $most_viewed = $wpdb->get_results("SELECT DISTINCT $wpdb->posts.*, (meta_value+0) AS views FROM $wpdb->posts LEFT JOIN $wpdb->postmeta ON $wpdb->postmeta.post_id = $wpdb->posts.ID WHERE $date_limit AND $where AND post_status = 'publish' AND meta_key = 'views' AND post_password = '' ORDER  BY views DESC LIMIT $limit");
            if ($most_viewed) {
                foreach ($most_viewed as $post) {
                    $post_views = intval($post->views);
                    $post_title = get_the_title();
                    if ($chars > 0) {
                        $post_title = snippet_text($post_title, $chars);
                    }
                    $post_excerpt = views_post_excerpt($post->post_excerpt, $post->post_content, $post->post_password, $chars);
                    $post_content = get_the_content();
                    $temp = stripslashes($views_options['most_viewed_template']);
                    $temp = str_replace("%VIEW_COUNT%", number_format_i18n($post_views), $temp);
                    $temp = str_replace("%POST_TITLE%", $post_title, $temp);
                    $temp = str_replace("%POST_EXCERPT%", $post_excerpt, $temp);
                    $temp = str_replace("%POST_CONTENT%", $post_content, $temp);
                    $temp = str_replace("%POST_URL%", get_permalink(), $temp);
                    $output .= $temp;
                }
            } else {
                $output = '<li>' . __('N/A', 'wp-postviews') . '</li>' . "\n";
            }
            if ($display) {
                echo $output;
            } else {
                return $output;
            }
            echo "</ul>";
        }

    }

Thanks..