使用条件标记post\\u type\\u exists（）检查post type book是否存在，如果存在，则向其添加分类法，否则不存在
<?php
if( post_type_exists( \'book\' ){
add_action( \'init\', \'create_book_taxonomies\' );
// create two taxonomies, genres and writers for the post type "book"
function create_book_taxonomies() {
// Add new taxonomy, make it hierarchical (like categories)
$labels = array(
\'name\' => _x( \'Genres\', \'taxonomy general name\', \'textdomain\' ),
\'singular_name\' => _x( \'Genre\', \'taxonomy singular name\', \'textdomain\' ),
\'search_items\' => __( \'Search Genres\', \'textdomain\' ),
\'all_items\' => __( \'All Genres\', \'textdomain\' ),
\'parent_item\' => __( \'Parent Genre\', \'textdomain\' ),
\'parent_item_colon\' => __( \'Parent Genre:\', \'textdomain\' ),
\'edit_item\' => __( \'Edit Genre\', \'textdomain\' ),
\'update_item\' => __( \'Update Genre\', \'textdomain\' ),
\'add_new_item\' => __( \'Add New Genre\', \'textdomain\' ),
\'new_item_name\' => __( \'New Genre Name\', \'textdomain\' ),
\'menu_name\' => __( \'Genre\', \'textdomain\' ),
);
$args = array(
\'hierarchical\' => true,
\'labels\' => $labels,
\'show_ui\' => true,
\'show_admin_column\' => true,
\'query_var\' => true,
\'rewrite\' => array( \'slug\' => \'genre\' ),
);
register_taxonomy( \'genre\', array( \'book\' ), $args );
// Add new taxonomy, NOT hierarchical (like tags)
$labels = array(
\'name\' => _x( \'Writers\', \'taxonomy general name\', \'textdomain\' ),
\'singular_name\' => _x( \'Writer\', \'taxonomy singular name\', \'textdomain\' ),
\'search_items\' => __( \'Search Writers\', \'textdomain\' ),
\'popular_items\' => __( \'Popular Writers\', \'textdomain\' ),
\'all_items\' => __( \'All Writers\', \'textdomain\' ),
\'parent_item\' => null,
\'parent_item_colon\' => null,
\'edit_item\' => __( \'Edit Writer\', \'textdomain\' ),
\'update_item\' => __( \'Update Writer\', \'textdomain\' ),
\'add_new_item\' => __( \'Add New Writer\', \'textdomain\' ),
\'new_item_name\' => __( \'New Writer Name\', \'textdomain\' ),
\'separate_items_with_commas\' => __( \'Separate writers with commas\', \'textdomain\' ),
\'add_or_remove_items\' => __( \'Add or remove writers\', \'textdomain\' ),
\'choose_from_most_used\' => __( \'Choose from the most used writers\', \'textdomain\' ),
\'not_found\' => __( \'No writers found.\', \'textdomain\' ),
\'menu_name\' => __( \'Writers\', \'textdomain\' ),
);
$args = array(
\'hierarchical\' => false,
\'labels\' => $labels,
\'show_ui\' => true,
\'show_admin_column\' => true,
\'update_count_callback\' => \'_update_post_term_count\',
\'query_var\' => true,
\'rewrite\' => array( \'slug\' => \'writer\' ),
);
register_taxonomy( \'writer\', \'book\', $args );
}
}
或者，如果您尚未创建post type book，您可以这样做：
/**
* Register a custom post type called "book".
*
* @see get_post_type_labels() for label keys.
*/
function wpdocs_codex_book_init() {
$labels = array(
\'name\' => _x( \'Books\', \'Post type general name\', \'textdomain\' ),
\'singular_name\' => _x( \'Book\', \'Post type singular name\', \'textdomain\' ),
\'menu_name\' => _x( \'Books\', \'Admin Menu text\', \'textdomain\' ),
\'name_admin_bar\' => _x( \'Book\', \'Add New on Toolbar\', \'textdomain\' ),
\'add_new\' => __( \'Add New\', \'textdomain\' ),
\'add_new_item\' => __( \'Add New Book\', \'textdomain\' ),
\'new_item\' => __( \'New Book\', \'textdomain\' ),
\'edit_item\' => __( \'Edit Book\', \'textdomain\' ),
\'view_item\' => __( \'View Book\', \'textdomain\' ),
\'all_items\' => __( \'All Books\', \'textdomain\' ),
\'search_items\' => __( \'Search Books\', \'textdomain\' ),
\'parent_item_colon\' => __( \'Parent Books:\', \'textdomain\' ),
\'not_found\' => __( \'No books found.\', \'textdomain\' ),
\'not_found_in_trash\' => __( \'No books found in Trash.\', \'textdomain\' ),
\'featured_image\' => _x( \'Book Cover Image\', \'Overrides the “Featured Image” phrase for this post type. Added in 4.3\', \'textdomain\' ),
\'set_featured_image\' => _x( \'Set cover image\', \'Overrides the “Set featured image” phrase for this post type. Added in 4.3\', \'textdomain\' ),
\'remove_featured_image\' => _x( \'Remove cover image\', \'Overrides the “Remove featured image” phrase for this post type. Added in 4.3\', \'textdomain\' ),
\'use_featured_image\' => _x( \'Use as cover image\', \'Overrides the “Use as featured image” phrase for this post type. Added in 4.3\', \'textdomain\' ),
\'archives\' => _x( \'Book archives\', \'The post type archive label used in nav menus. Default “Post Archives”. Added in 4.4\', \'textdomain\' ),
\'insert_into_item\' => _x( \'Insert into book\', \'Overrides the “Insert into post”/”Insert into page” phrase (used when inserting media into a post). Added in 4.4\', \'textdomain\' ),
\'uploaded_to_this_item\' => _x( \'Uploaded to this book\', \'Overrides the “Uploaded to this post”/”Uploaded to this page” phrase (used when viewing media attached to a post). Added in 4.4\', \'textdomain\' ),
\'filter_items_list\' => _x( \'Filter books list\', \'Screen reader text for the filter links heading on the post type listing screen. Default “Filter posts list”/”Filter pages list”. Added in 4.4\', \'textdomain\' ),
\'items_list_navigation\' => _x( \'Books list navigation\', \'Screen reader text for the pagination heading on the post type listing screen. Default “Posts list navigation”/”Pages list navigation”. Added in 4.4\', \'textdomain\' ),
\'items_list\' => _x( \'Books list\', \'Screen reader text for the items list heading on the post type listing screen. Default “Posts list”/”Pages list”. Added in 4.4\', \'textdomain\' ),
);
$args = array(
\'labels\' => $labels,
\'public\' => true,
\'publicly_queryable\' => true,
\'show_ui\' => true,
\'show_in_menu\' => true,
\'query_var\' => true,
\'rewrite\' => array( \'slug\' => \'book\' ),
\'capability_type\' => \'post\',
\'has_archive\' => true,
\'hierarchical\' => false,
\'menu_position\' => null,
\'supports\' => array( \'title\', \'editor\', \'author\', \'thumbnail\', \'excerpt\', \'comments\' ),
);
register_post_type( \'book\', $args );
}
add_action( \'init\', \'wpdocs_codex_book_init\' );
add_action( \'init\', \'create_book_taxonomies\' );
// create two taxonomies, genres and writers for the post type "book"
function create_book_taxonomies() {
// Add new taxonomy, make it hierarchical (like categories)
$labels = array(
\'name\' => _x( \'Genres\', \'taxonomy general name\', \'textdomain\' ),
\'singular_name\' => _x( \'Genre\', \'taxonomy singular name\', \'textdomain\' ),
\'search_items\' => __( \'Search Genres\', \'textdomain\' ),
\'all_items\' => __( \'All Genres\', \'textdomain\' ),
\'parent_item\' => __( \'Parent Genre\', \'textdomain\' ),
\'parent_item_colon\' => __( \'Parent Genre:\', \'textdomain\' ),
\'edit_item\' => __( \'Edit Genre\', \'textdomain\' ),
\'update_item\' => __( \'Update Genre\', \'textdomain\' ),
\'add_new_item\' => __( \'Add New Genre\', \'textdomain\' ),
\'new_item_name\' => __( \'New Genre Name\', \'textdomain\' ),
\'menu_name\' => __( \'Genre\', \'textdomain\' ),
);
$args = array(
\'hierarchical\' => true,
\'labels\' => $labels,
\'show_ui\' => true,
\'show_admin_column\' => true,
\'query_var\' => true,
\'rewrite\' => array( \'slug\' => \'genre\' ),
);
register_taxonomy( \'genre\', array( \'book\' ), $args );
// Add new taxonomy, NOT hierarchical (like tags)
$labels = array(
\'name\' => _x( \'Writers\', \'taxonomy general name\', \'textdomain\' ),
\'singular_name\' => _x( \'Writer\', \'taxonomy singular name\', \'textdomain\' ),
\'search_items\' => __( \'Search Writers\', \'textdomain\' ),
\'popular_items\' => __( \'Popular Writers\', \'textdomain\' ),
\'all_items\' => __( \'All Writers\', \'textdomain\' ),
\'parent_item\' => null,
\'parent_item_colon\' => null,
\'edit_item\' => __( \'Edit Writer\', \'textdomain\' ),
\'update_item\' => __( \'Update Writer\', \'textdomain\' ),
\'add_new_item\' => __( \'Add New Writer\', \'textdomain\' ),
\'new_item_name\' => __( \'New Writer Name\', \'textdomain\' ),
\'separate_items_with_commas\' => __( \'Separate writers with commas\', \'textdomain\' ),
\'add_or_remove_items\' => __( \'Add or remove writers\', \'textdomain\' ),
\'choose_from_most_used\' => __( \'Choose from the most used writers\', \'textdomain\' ),
\'not_found\' => __( \'No writers found.\', \'textdomain\' ),
\'menu_name\' => __( \'Writers\', \'textdomain\' ),
);
$args = array(
\'hierarchical\' => false,
\'labels\' => $labels,
\'show_ui\' => true,
\'show_admin_column\' => true,
\'update_count_callback\' => \'_update_post_term_count\',
\'query_var\' => true,
\'rewrite\' => array( \'slug\' => \'writer\' ),
);
register_taxonomy( \'writer\', \'book\', $args );
// Following code will assign default taxonomy to genre taxonomy
if( !term_exists( \'intelligence\', \'genre\' ) ){
$parent_term = term_exists( \'genre\', \'genre\' );
wp_insert_term(
\'Intelligence\',
\'genre\',
array(
\'description\'=> \'Book about Intelligence\',
\'slug\' => \'intelligence\',
\'parent\'=> $parent_term[\'term_id\']
)
);
}
}
我已经测试了这段代码，它可以正常工作，应该也可以正常工作
如果要将自定义分类添加到wordpress帖子，请使用：
register_taxonomy( \'writer\', array( \'book\', \'post\' ), $args );
