Featured_Content::init PHP Method

        public static function init()
        {
            $theme_support = get_theme_support('featured-content');
            // Return early if theme does not support featured content.
            if (!$theme_support) {
                return;
            }
            /*
             * An array of named arguments must be passed as the second parameter
             * of add_theme_support().
             */
            if (!isset($theme_support[0])) {
                return;
            }
            if (isset($theme_support[0]['featured_content_filter'])) {
                $theme_support[0]['filter'] = $theme_support[0]['featured_content_filter'];
                unset($theme_support[0]['featured_content_filter']);
            }
            // Return early if "filter" has not been defined.
            if (!isset($theme_support[0]['filter'])) {
                return;
            }
            // Theme can override the number of max posts.
            if (isset($theme_support[0]['max_posts'])) {
                self::$max_posts = absint($theme_support[0]['max_posts']);
            }
            add_filter($theme_support[0]['filter'], array(__CLASS__, 'get_featured_posts'));
            add_action('customize_register', array(__CLASS__, 'customize_register'), 9);
            add_action('admin_init', array(__CLASS__, 'register_setting'));
            add_action('save_post', array(__CLASS__, 'delete_transient'));
            add_action('delete_post_tag', array(__CLASS__, 'delete_post_tag'));
            add_action('customize_controls_enqueue_scripts', array(__CLASS__, 'enqueue_scripts'));
            add_action('pre_get_posts', array(__CLASS__, 'pre_get_posts'));
            add_action('switch_theme', array(__CLASS__, 'switch_theme'));
            add_action('switch_theme', array(__CLASS__, 'delete_transient'));
            add_action('wp_loaded', array(__CLASS__, 'wp_loaded'));
            add_action('split_shared_term', array(__CLASS__, 'jetpack_update_featured_content_for_split_terms', 10, 4));
            if (isset($theme_support[0]['additional_post_types'])) {
                $theme_support[0]['post_types'] = array_merge(array('post'), (array) $theme_support[0]['additional_post_types']);
                unset($theme_support[0]['additional_post_types']);
            }
            // Themes can allow Featured Content pages
            if (isset($theme_support[0]['post_types'])) {
                self::$post_types = array_merge(self::$post_types, (array) $theme_support[0]['post_types']);
                // register post_tag support for each post type
                foreach (self::$post_types as $post_type) {
                    register_taxonomy_for_object_type('post_tag', $post_type);
                }
            }
        }