+/**
+ * Get a list of all registered post type objects.
+ *
+ * @since 2.9.0
+ *
+ * @global array $wp_post_types List of post types.
+ *
+ * @see register_post_type() for accepted arguments.
+ *
+ * @param array|string $args Optional. An array of key => value arguments to match against
+ * the post type objects. Default empty array.
+ * @param string $output Optional. The type of output to return. Accepts post type 'names'
+ * or 'objects'. Default 'names'.
+ * @param string $operator Optional. The logical operation to perform. 'or' means only one
+ * element from the array needs to match; 'and' means all elements
+ * must match. Accepts 'or' or 'and'. Default 'and'.
+ * @return array A list of post type names or objects.
+ */
+function get_post_types( $args = array(), $output = 'names', $operator = 'and' ) {
+ global $wp_post_types;
+
+ $field = ('names' == $output) ? 'name' : false;
+
+ return wp_filter_object_list($wp_post_types, $args, $operator, $field);
+}
+
+/**
+ * Register a post type. Do not use before init.
+ *
+ * A function for creating or modifying a post type based on the
+ * parameters given. The function will accept an array (second optional
+ * parameter), along with a string for the post type name.
+ *
+ * @since 2.9.0
+ *
+ * @global array $wp_post_types List of post types.
+ * @global WP_Rewrite $wp_rewrite Used for default feeds.
+ * @global WP $wp Used to add query vars.
+ *
+ * @param string $post_type Post type key, must not exceed 20 characters.
+ * @param array|string $args {
+ * Array or string of arguments for registering a post type.
+ *
+ * @type string $label Name of the post type shown in the menu. Usually plural.
+ * Default is value of $labels['name'].
+ * @type array $labels An array of labels for this post type. If not set, post
+ * labels are inherited for non-hierarchical types and page
+ * labels for hierarchical ones. {@see get_post_type_labels()}.
+ * @type string $description A short descriptive summary of what the post type is.
+ * Default empty.
+ * @type bool $public Whether a post type is intended for use publicly either via
+ * the admin interface or by front-end users. While the default
+ * settings of $exclude_from_search, $publicly_queryable, $show_ui,
+ * and $show_in_nav_menus are inherited from public, each does not
+ * rely on this relationship and controls a very specific intention.
+ * Default false.
+ * @type bool $hierarchical Whether the post type is hierarchical (e.g. page). Default false.
+ * @type bool $exclude_from_search Whether to exclude posts with this post type from front end search
+ * results. Default is the opposite value of $public.
+ * @type bool $publicly_queryable Whether queries can be performed on the front end for the post type
+ * as part of {@see parse_request()}. Endpoints would include:
+ * * ?post_type={post_type_key}
+ * * ?{post_type_key}={single_post_slug}
+ * * ?{post_type_query_var}={single_post_slug}
+ * If not set, the default is inherited from $public.
+ * @type bool $show_ui Whether to generate a default UI for managing this post type in the
+ * admin. Default is value of $public.
+ * @type bool $show_in_menu Where to show the post type in the admin menu. To work, $show_ui
+ * must be true. If true, the post type is shown in its own top level
+ * menu. If false, no menu is shown. If a string of an existing top
+ * level menu (eg. 'tools.php' or 'edit.php?post_type=page'), the post
+ * type will be placed as a sub-menu of that.
+ * Default is value of $show_ui.
+ * @type bool $show_in_nav_menus Makes this post type available for selection in navigation menus.
+ * Default is value $public.
+ * @type bool $show_in_admin_bar Makes this post type available via the admin bar. Default is value
+ * of $show_in_menu.
+ * @type int $menu_position The position in the menu order the post type should appear. To work,
+ * $show_in_menu must be true. Default null (at the bottom).
+ * @type string $menu_icon The url to the icon to be used for this menu. Pass a base64-encoded
+ * SVG using a data URI, which will be colored to match the color scheme
+ * -- this should begin with 'data:image/svg+xml;base64,'. Pass the name
+ * of a Dashicons helper class to use a font icon, e.g.
+ * 'dashicons-chart-pie'. Pass 'none' to leave div.wp-menu-image empty
+ * so an icon can be added via CSS. Defaults to use the posts icon.
+ * @type string $capability_type The string to use to build the read, edit, and delete capabilities.
+ * May be passed as an array to allow for alternative plurals when using
+ * this argument as a base to construct the capabilities, e.g.
+ * array('story', 'stories'). Default 'post'.
+ * @type array $capabilities Array of capabilities for this post type. $capability_type is used
+ * as a base to construct capabilities by default.
+ * {@see get_post_type_capabilities()}.
+ * @type bool $map_meta_cap Whether to use the internal default meta capability handling.
+ * Default false.
+ * @type array $supports An alias for calling {@see add_post_type_support()} directly.
+ * Defaults to array containing 'title' & 'editor'.
+ * @type callback $register_meta_box_cb Provide a callback function that sets up the meta boxes for the
+ * edit form. Do remove_meta_box() and add_meta_box() calls in the
+ * callback. Default null.
+ * @type array $taxonomies An array of taxonomy identifiers that will be registered for the
+ * post type. Taxonomies can be registered later with
+ * {@see register_taxonomy()} or {@see register_taxonomy_for_object_type()}.
+ * Default empty array.
+ * @type bool|string $has_archive Whether there should be post type archives, or if a string, the
+ * archive slug to use. Will generate the proper rewrite rules if
+ * $rewrite is enabled. Default false.
+ * @type bool|array $rewrite {
+ * Triggers the handling of rewrites for this post type. To prevent rewrite, set to false.
+ * Defaults to true, using $post_type as slug. To specify rewrite rules, an array can be
+ * passed with any of these keys:
+ *
+ * @type string $slug Customize the permastruct slug. Defaults to $post_type key.
+ * @type bool $with_front Whether the permastruct should be prepended with WP_Rewrite::$front.
+ * Default true.
+ * @type bool $feeds Whether the feed permastruct should be built for this post type.
+ * Default is value of $has_archive.
+ * @type bool $pages Whether the permastruct should provide for pagination. Default true.
+ * @type const $ep_mask Endpoint mask to assign. If not specified and permalink_epmask is set,
+ * inherits from $permalink_epmask. If not specified and permalink_epmask
+ * is not set, defaults to EP_PERMALINK.
+ * }
+ * @type string|bool $query_var Sets the query_var key for this post type. Defaults to $post_type
+ * key. If false, a post type cannot be loaded at
+ * ?{query_var}={post_slug}. If specified as a string, the query
+ * ?{query_var_string}={post_slug} will be valid.
+ * @type bool $can_export Whether to allow this post type to be exported. Default true.
+ * @type bool $delete_with_user Whether to delete posts of this type when deleting a user. If true,
+ * posts of this type belonging to the user will be moved to trash
+ * when then user is deleted. If false, posts of this type belonging
+ * to the user will *not* be trashed or deleted. If not set (the default),
+ * posts are trashed if post_type_supports('author'). Otherwise posts
+ * are not trashed or deleted. Default null.
+ * @type bool $_builtin FOR INTERNAL USE ONLY! True if this post type is a native or
+ * "built-in" post_type. Default false.
+ * @type string $_edit_link FOR INTERNAL USE ONLY! URL segment to use for edit link of
+ * this post type. Default 'post.php?post=%d'.
+ * }
+ * @return object|WP_Error The registered post type object, or an error object.
+ */
+function register_post_type( $post_type, $args = array() ) {
+ global $wp_post_types, $wp_rewrite, $wp;
+
+ if ( ! is_array( $wp_post_types ) )
+ $wp_post_types = array();
+
+ // Args prefixed with an underscore are reserved for internal use.
+ $defaults = array(
+ 'labels' => array(),
+ 'description' => '',
+ 'public' => false,
+ 'hierarchical' => false,
+ 'exclude_from_search' => null,
+ 'publicly_queryable' => null,
+ 'show_ui' => null,
+ 'show_in_menu' => null,
+ 'show_in_nav_menus' => null,
+ 'show_in_admin_bar' => null,
+ 'menu_position' => null,
+ 'menu_icon' => null,
+ 'capability_type' => 'post',
+ 'capabilities' => array(),
+ 'map_meta_cap' => null,
+ 'supports' => array(),
+ 'register_meta_box_cb' => null,
+ 'taxonomies' => array(),
+ 'has_archive' => false,
+ 'rewrite' => true,
+ 'query_var' => true,
+ 'can_export' => true,
+ 'delete_with_user' => null,
+ '_builtin' => false,
+ '_edit_link' => 'post.php?post=%d',
+ );
+ $args = wp_parse_args( $args, $defaults );
+ $args = (object) $args;
+
+ $post_type = sanitize_key( $post_type );
+ $args->name = $post_type;
+
+ if ( empty( $post_type ) || strlen( $post_type ) > 20 ) {
+ _doing_it_wrong( __FUNCTION__, __( 'Post type names must be between 1 and 20 characters in length.' ), '4.2' );
+ return new WP_Error( 'post_type_length_invalid', __( 'Post type names must be between 1 and 20 characters in length.' ) );
+ }
+
+ // If not set, default to the setting for public.
+ if ( null === $args->publicly_queryable )
+ $args->publicly_queryable = $args->public;
+
+ // If not set, default to the setting for public.
+ if ( null === $args->show_ui )
+ $args->show_ui = $args->public;
+
+ // If not set, default to the setting for show_ui.
+ if ( null === $args->show_in_menu || ! $args->show_ui )
+ $args->show_in_menu = $args->show_ui;
+
+ // If not set, default to the whether the full UI is shown.
+ if ( null === $args->show_in_admin_bar )
+ $args->show_in_admin_bar = (bool) $args->show_in_menu;
+
+ // If not set, default to the setting for public.
+ if ( null === $args->show_in_nav_menus )
+ $args->show_in_nav_menus = $args->public;
+
+ // If not set, default to true if not public, false if public.
+ if ( null === $args->exclude_from_search )
+ $args->exclude_from_search = !$args->public;
+
+ // Back compat with quirky handling in version 3.0. #14122.
+ if ( empty( $args->capabilities ) && null === $args->map_meta_cap && in_array( $args->capability_type, array( 'post', 'page' ) ) )
+ $args->map_meta_cap = true;
+
+ // If not set, default to false.
+ if ( null === $args->map_meta_cap )
+ $args->map_meta_cap = false;
+
+ $args->cap = get_post_type_capabilities( $args );
+ unset( $args->capabilities );
+
+ if ( is_array( $args->capability_type ) )
+ $args->capability_type = $args->capability_type[0];
+
+ if ( ! empty( $args->supports ) ) {
+ add_post_type_support( $post_type, $args->supports );
+ unset( $args->supports );
+ } elseif ( false !== $args->supports ) {
+ // Add default features
+ add_post_type_support( $post_type, array( 'title', 'editor' ) );
+ }
+
+ if ( false !== $args->query_var && ! empty( $wp ) ) {
+ if ( true === $args->query_var )
+ $args->query_var = $post_type;
+ else
+ $args->query_var = sanitize_title_with_dashes( $args->query_var );
+ $wp->add_query_var( $args->query_var );
+ }
+
+ if ( false !== $args->rewrite && ( is_admin() || '' != get_option( 'permalink_structure' ) ) ) {
+ if ( ! is_array( $args->rewrite ) )
+ $args->rewrite = array();
+ if ( empty( $args->rewrite['slug'] ) )
+ $args->rewrite['slug'] = $post_type;
+ if ( ! isset( $args->rewrite['with_front'] ) )
+ $args->rewrite['with_front'] = true;
+ if ( ! isset( $args->rewrite['pages'] ) )
+ $args->rewrite['pages'] = true;
+ if ( ! isset( $args->rewrite['feeds'] ) || ! $args->has_archive )
+ $args->rewrite['feeds'] = (bool) $args->has_archive;
+ if ( ! isset( $args->rewrite['ep_mask'] ) ) {
+ if ( isset( $args->permalink_epmask ) )
+ $args->rewrite['ep_mask'] = $args->permalink_epmask;
+ else
+ $args->rewrite['ep_mask'] = EP_PERMALINK;
+ }
+
+ if ( $args->hierarchical )
+ add_rewrite_tag( "%$post_type%", '(.+?)', $args->query_var ? "{$args->query_var}=" : "post_type=$post_type&pagename=" );
+ else
+ add_rewrite_tag( "%$post_type%", '([^/]+)', $args->query_var ? "{$args->query_var}=" : "post_type=$post_type&name=" );
+
+ if ( $args->has_archive ) {
+ $archive_slug = $args->has_archive === true ? $args->rewrite['slug'] : $args->has_archive;
+ if ( $args->rewrite['with_front'] )
+ $archive_slug = substr( $wp_rewrite->front, 1 ) . $archive_slug;
+ else
+ $archive_slug = $wp_rewrite->root . $archive_slug;
+
+ add_rewrite_rule( "{$archive_slug}/?$", "index.php?post_type=$post_type", 'top' );
+ if ( $args->rewrite['feeds'] && $wp_rewrite->feeds ) {
+ $feeds = '(' . trim( implode( '|', $wp_rewrite->feeds ) ) . ')';
+ add_rewrite_rule( "{$archive_slug}/feed/$feeds/?$", "index.php?post_type=$post_type" . '&feed=$matches[1]', 'top' );
+ add_rewrite_rule( "{$archive_slug}/$feeds/?$", "index.php?post_type=$post_type" . '&feed=$matches[1]', 'top' );
+ }
+ if ( $args->rewrite['pages'] )
+ add_rewrite_rule( "{$archive_slug}/{$wp_rewrite->pagination_base}/([0-9]{1,})/?$", "index.php?post_type=$post_type" . '&paged=$matches[1]', 'top' );
+ }
+
+ $permastruct_args = $args->rewrite;
+ $permastruct_args['feed'] = $permastruct_args['feeds'];
+ add_permastruct( $post_type, "{$args->rewrite['slug']}/%$post_type%", $permastruct_args );
+ }
+
+ // Register the post type meta box if a custom callback was specified.
+ if ( $args->register_meta_box_cb )
+ add_action( 'add_meta_boxes_' . $post_type, $args->register_meta_box_cb, 10, 1 );
+
+ $args->labels = get_post_type_labels( $args );
+ $args->label = $args->labels->name;
+
+ $wp_post_types[ $post_type ] = $args;
+
+ add_action( 'future_' . $post_type, '_future_post_hook', 5, 2 );
+
+ foreach ( $args->taxonomies as $taxonomy ) {
+ register_taxonomy_for_object_type( $taxonomy, $post_type );
+ }