Filter in admin list

filter.php

<?PHP


abstract class My_AdminList {
    public static $taxonomies = array("menu_category");
    public static $post_types = array("owns_restaurant_item");

    /**
     * Admin init hook
     */
    public static function init() {
        global $typenow;
        if (!in_array($typenow, self::$post_types))
            return;

        add_action("restrict_manage_posts", array(__CLASS__, 'filter_show_select'));
        add_action("parse_query", array(__CLASS__, 'parse_query'));
    }

    /**
     * Filter the query
     *
     * @param WP_Query $query
     */
    public static function parse_query(&$query) {
        $tax_query = array();

        foreach (self::$taxonomies as $tax_slug) {
            if (isset($_GET[$tax_slug])) {
                $tax_query[] = array(
                    "taxonomy" => $tax_slug,
                    "field" => "slug",
                    "terms" => $_GET[$tax_slug]
                );
            }
        }

        if (!empty($tax_query)) {
            $query->query_vars["tax_query"] = array_merge(array("relation" => "AND"), $tax_query);
        }
    }

    /**
     * Select box to filter (echo)
     */
    public static function filter_show_select() {
        foreach (self::$taxonomies as $tax_slug) {
            $tax_obj = get_taxonomy($tax_slug);
            $tax_name = $tax_obj->labels->name;
            $terms = get_terms($tax_slug);

            // output html for taxonomy dropdown filter
            echo "<select name='$tax_slug' id='$tax_slug' class='postform'>";
            echo "<option value=''>Show All $tax_name</option>";
            foreach ($terms as $term) {
                echo '<option value='. $term->slug, $_GET[$tax_slug] == $term->slug ? ' selected="selected"' : '','>' . $term->name .' (' . $term->count .')</option>';
            }
            echo "</select>";
        }
    }
}

if (is_admin())
    add_action('load-edit.php', array('My_AdminList', 'init'));