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taxonomy.php
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taxonomy.php
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<?php
/**
* Core Taxonomy API
*
* @package WordPress
* @subpackage Taxonomy
*/
//
// Taxonomy registration.
//
/**
* Creates the initial taxonomies.
*
* This function fires twice: in wp-settings.php before plugins are loaded (for
* backward compatibility reasons), and again on the {@see 'init'} action. We must
* avoid registering rewrite rules before the {@see 'init'} action.
*
* @since 2.8.0
*
* @global WP_Rewrite $wp_rewrite WordPress rewrite component.
*/
function create_initial_taxonomies() {
global $wp_rewrite;
if ( ! did_action( 'init' ) ) {
$rewrite = array(
'category' => false,
'post_tag' => false,
'post_format' => false,
);
} else {
/**
* Filters the post formats rewrite base.
*
* @since 3.1.0
*
* @param string $context Context of the rewrite base. Default 'type'.
*/
$post_format_base = apply_filters( 'post_format_rewrite_base', 'type' );
$rewrite = array(
'category' => array(
'hierarchical' => true,
'slug' => get_option( 'category_base' ) ? get_option( 'category_base' ) : 'category',
'with_front' => ! get_option( 'category_base' ) || $wp_rewrite->using_index_permalinks(),
'ep_mask' => EP_CATEGORIES,
),
'post_tag' => array(
'hierarchical' => false,
'slug' => get_option( 'tag_base' ) ? get_option( 'tag_base' ) : 'tag',
'with_front' => ! get_option( 'tag_base' ) || $wp_rewrite->using_index_permalinks(),
'ep_mask' => EP_TAGS,
),
'post_format' => $post_format_base ? array( 'slug' => $post_format_base ) : false,
);
}
register_taxonomy(
'category',
'post',
array(
'hierarchical' => true,
'query_var' => 'category_name',
'rewrite' => $rewrite['category'],
'public' => true,
'show_ui' => true,
'show_admin_column' => true,
'_builtin' => true,
'capabilities' => array(
'manage_terms' => 'manage_categories',
'edit_terms' => 'edit_categories',
'delete_terms' => 'delete_categories',
'assign_terms' => 'assign_categories',
),
'show_in_rest' => true,
'rest_base' => 'categories',
'rest_controller_class' => 'WP_REST_Terms_Controller',
)
);
register_taxonomy(
'post_tag',
'post',
array(
'hierarchical' => false,
'query_var' => 'tag',
'rewrite' => $rewrite['post_tag'],
'public' => true,
'show_ui' => true,
'show_admin_column' => true,
'_builtin' => true,
'capabilities' => array(
'manage_terms' => 'manage_post_tags',
'edit_terms' => 'edit_post_tags',
'delete_terms' => 'delete_post_tags',
'assign_terms' => 'assign_post_tags',
),
'show_in_rest' => true,
'rest_base' => 'tags',
'rest_controller_class' => 'WP_REST_Terms_Controller',
)
);
register_taxonomy(
'nav_menu',
'nav_menu_item',
array(
'public' => false,
'hierarchical' => false,
'labels' => array(
'name' => __( 'Navigation Menus' ),
'singular_name' => __( 'Navigation Menu' ),
),
'query_var' => false,
'rewrite' => false,
'show_ui' => false,
'_builtin' => true,
'show_in_nav_menus' => false,
)
);
register_taxonomy(
'link_category',
'link',
array(
'hierarchical' => false,
'labels' => array(
'name' => __( 'Link Categories' ),
'singular_name' => __( 'Link Category' ),
'search_items' => __( 'Search Link Categories' ),
'popular_items' => null,
'all_items' => __( 'All Link Categories' ),
'edit_item' => __( 'Edit Link Category' ),
'update_item' => __( 'Update Link Category' ),
'add_new_item' => __( 'Add New Link Category' ),
'new_item_name' => __( 'New Link Category Name' ),
'separate_items_with_commas' => null,
'add_or_remove_items' => null,
'choose_from_most_used' => null,
'back_to_items' => __( '← Go to Link Categories' ),
),
'capabilities' => array(
'manage_terms' => 'manage_links',
'edit_terms' => 'manage_links',
'delete_terms' => 'manage_links',
'assign_terms' => 'manage_links',
),
'query_var' => false,
'rewrite' => false,
'public' => false,
'show_ui' => true,
'_builtin' => true,
)
);
register_taxonomy(
'post_format',
'post',
array(
'public' => true,
'hierarchical' => false,
'labels' => array(
'name' => _x( 'Formats', 'post format' ),
'singular_name' => _x( 'Format', 'post format' ),
),
'query_var' => true,
'rewrite' => $rewrite['post_format'],
'show_ui' => false,
'_builtin' => true,
'show_in_nav_menus' => current_theme_supports( 'post-formats' ),
)
);
}
/**
* Retrieves a list of registered taxonomy names or objects.
*
* @since 3.0.0
*
* @global array $wp_taxonomies The registered taxonomies.
*
* @param array $args Optional. An array of `key => value` arguments to match against the taxonomy objects.
* Default empty array.
* @param string $output Optional. The type of output to return in the array. Accepts either taxonomy 'names'
* or 'objects'. Default 'names'.
* @param string $operator Optional. The logical operation to perform. Accepts 'and' or 'or'. 'or' means only
* one element from the array needs to match; 'and' means all elements must match.
* Default 'and'.
* @return string[]|WP_Taxonomy[] An array of taxonomy names or objects.
*/
function get_taxonomies( $args = array(), $output = 'names', $operator = 'and' ) {
global $wp_taxonomies;
$field = ( 'names' === $output ) ? 'name' : false;
return wp_filter_object_list( $wp_taxonomies, $args, $operator, $field );
}
/**
* Return the names or objects of the taxonomies which are registered for the requested object or object type, such as
* a post object or post type name.
*
* Example:
*
* $taxonomies = get_object_taxonomies( 'post' );
*
* This results in:
*
* Array( 'category', 'post_tag' )
*
* @since 2.3.0
*
* @global array $wp_taxonomies The registered taxonomies.
*
* @param string|string[]|WP_Post $object Name of the type of taxonomy object, or an object (row from posts)
* @param string $output Optional. The type of output to return in the array. Accepts either
* 'names' or 'objects'. Default 'names'.
* @return string[]|WP_Taxonomy[] The names or objects of all taxonomies of `$object_type`.
*/
function get_object_taxonomies( $object, $output = 'names' ) {
global $wp_taxonomies;
if ( is_object( $object ) ) {
if ( 'attachment' === $object->post_type ) {
return get_attachment_taxonomies( $object, $output );
}
$object = $object->post_type;
}
$object = (array) $object;
$taxonomies = array();
foreach ( (array) $wp_taxonomies as $tax_name => $tax_obj ) {
if ( array_intersect( $object, (array) $tax_obj->object_type ) ) {
if ( 'names' === $output ) {
$taxonomies[] = $tax_name;
} else {
$taxonomies[ $tax_name ] = $tax_obj;
}
}
}
return $taxonomies;
}
/**
* Retrieves the taxonomy object of $taxonomy.
*
* The get_taxonomy function will first check that the parameter string given
* is a taxonomy object and if it is, it will return it.
*
* @since 2.3.0
*
* @global array $wp_taxonomies The registered taxonomies.
*
* @param string $taxonomy Name of taxonomy object to return.
* @return WP_Taxonomy|false The Taxonomy Object or false if $taxonomy doesn't exist.
*/
function get_taxonomy( $taxonomy ) {
global $wp_taxonomies;
if ( ! taxonomy_exists( $taxonomy ) ) {
return false;
}
return $wp_taxonomies[ $taxonomy ];
}
/**
* Determines whether the taxonomy name exists.
*
* Formerly is_taxonomy(), introduced in 2.3.0.
*
* For more information on this and similar theme functions, check out
* the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
* Conditional Tags} article in the Theme Developer Handbook.
*
* @since 3.0.0
*
* @global array $wp_taxonomies The registered taxonomies.
*
* @param string $taxonomy Name of taxonomy object.
* @return bool Whether the taxonomy exists.
*/
function taxonomy_exists( $taxonomy ) {
global $wp_taxonomies;
return isset( $wp_taxonomies[ $taxonomy ] );
}
/**
* Determines whether the taxonomy object is hierarchical.
*
* Checks to make sure that the taxonomy is an object first. Then Gets the
* object, and finally returns the hierarchical value in the object.
*
* A false return value might also mean that the taxonomy does not exist.
*
* For more information on this and similar theme functions, check out
* the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
* Conditional Tags} article in the Theme Developer Handbook.
*
* @since 2.3.0
*
* @param string $taxonomy Name of taxonomy object.
* @return bool Whether the taxonomy is hierarchical.
*/
function is_taxonomy_hierarchical( $taxonomy ) {
if ( ! taxonomy_exists( $taxonomy ) ) {
return false;
}
$taxonomy = get_taxonomy( $taxonomy );
return $taxonomy->hierarchical;
}
/**
* Creates or modifies a taxonomy object.
*
* Note: Do not use before the {@see 'init'} hook.
*
* A simple function for creating or modifying a taxonomy object based on
* the parameters given. If modifying an existing taxonomy object, note
* that the `$object_type` value from the original registration will be
* overwritten.
*
* @since 2.3.0
* @since 4.2.0 Introduced `show_in_quick_edit` argument.
* @since 4.4.0 The `show_ui` argument is now enforced on the term editing screen.
* @since 4.4.0 The `public` argument now controls whether the taxonomy can be queried on the front end.
* @since 4.5.0 Introduced `publicly_queryable` argument.
* @since 4.7.0 Introduced `show_in_rest`, 'rest_base' and 'rest_controller_class'
* arguments to register the Taxonomy in REST API.
* @since 5.1.0 Introduced `meta_box_sanitize_cb` argument.
* @since 5.4.0 Added the registered taxonomy object as a return value.
* @since 5.5.0 Introduced `default_term` argument.
*
* @global array $wp_taxonomies Registered taxonomies.
*
* @param string $taxonomy Taxonomy key, must not exceed 32 characters.
* @param array|string $object_type Object type or array of object types with which the taxonomy should be associated.
* @param array|string $args {
* Optional. Array or query string of arguments for registering a taxonomy.
*
* @type string[] $labels An array of labels for this taxonomy. By default, Tag labels are
* used for non-hierarchical taxonomies, and Category labels are used
* for hierarchical taxonomies. See accepted values in
* get_taxonomy_labels(). Default empty array.
* @type string $description A short descriptive summary of what the taxonomy is for. Default empty.
* @type bool $public Whether a taxonomy is intended for use publicly either via
* the admin interface or by front-end users. The default settings
* of `$publicly_queryable`, `$show_ui`, and `$show_in_nav_menus`
* are inherited from `$public`.
* @type bool $publicly_queryable Whether the taxonomy is publicly queryable.
* If not set, the default is inherited from `$public`
* @type bool $hierarchical Whether the taxonomy is hierarchical. Default false.
* @type bool $show_ui Whether to generate and allow a UI for managing terms in this taxonomy in
* the admin. If not set, the default is inherited from `$public`
* (default true).
* @type bool $show_in_menu Whether to show the taxonomy in the admin menu. If true, the taxonomy is
* shown as a submenu of the object type menu. If false, no menu is shown.
* `$show_ui` must be true. If not set, default is inherited from `$show_ui`
* (default true).
* @type bool $show_in_nav_menus Makes this taxonomy available for selection in navigation menus. If not
* set, the default is inherited from `$public` (default true).
* @type bool $show_in_rest Whether to include the taxonomy in the REST API. Set this to true
* for the taxonomy to be available in the block editor.
* @type string $rest_base To change the base url of REST API route. Default is $taxonomy.
* @type string $rest_controller_class REST API Controller class name. Default is 'WP_REST_Terms_Controller'.
* @type bool $show_tagcloud Whether to list the taxonomy in the Tag Cloud Widget controls. If not set,
* the default is inherited from `$show_ui` (default true).
* @type bool $show_in_quick_edit Whether to show the taxonomy in the quick/bulk edit panel. It not set,
* the default is inherited from `$show_ui` (default true).
* @type bool $show_admin_column Whether to display a column for the taxonomy on its post type listing
* screens. Default false.
* @type bool|callable $meta_box_cb Provide a callback function for the meta box display. If not set,
* post_categories_meta_box() is used for hierarchical taxonomies, and
* post_tags_meta_box() is used for non-hierarchical. If false, no meta
* box is shown.
* @type callable $meta_box_sanitize_cb Callback function for sanitizing taxonomy data saved from a meta
* box. If no callback is defined, an appropriate one is determined
* based on the value of `$meta_box_cb`.
* @type string[] $capabilities {
* Array of capabilities for this taxonomy.
*
* @type string $manage_terms Default 'manage_categories'.
* @type string $edit_terms Default 'manage_categories'.
* @type string $delete_terms Default 'manage_categories'.
* @type string $assign_terms Default 'edit_posts'.
* }
* @type bool|array $rewrite {
* Triggers the handling of rewrites for this taxonomy. Default true, using $taxonomy as slug. To prevent
* rewrite, set to false. To specify rewrite rules, an array can be passed with any of these keys:
*
* @type string $slug Customize the permastruct slug. Default `$taxonomy` key.
* @type bool $with_front Should the permastruct be prepended with WP_Rewrite::$front. Default true.
* @type bool $hierarchical Either hierarchical rewrite tag or not. Default false.
* @type int $ep_mask Assign an endpoint mask. Default `EP_NONE`.
* }
* @type string|bool $query_var Sets the query var key for this taxonomy. Default `$taxonomy` key. If
* false, a taxonomy cannot be loaded at `?{query_var}={term_slug}`. If a
* string, the query `?{query_var}={term_slug}` will be valid.
* @type callable $update_count_callback Works much like a hook, in that it will be called when the count is
* updated. Default _update_post_term_count() for taxonomies attached
* to post types, which confirms that the objects are published before
* counting them. Default _update_generic_term_count() for taxonomies
* attached to other object types, such as users.
* @type string|array $default_term {
* Default term to be used for the taxonomy.
*
* @type string $name Name of default term.
* @type string $slug Slug for default term. Default empty.
* @type string $description Description for default term. Default empty.
* }
* @type bool $sort Whether terms in this taxonomy should be sorted in the order they are
* provided to `wp_set_object_terms()`. Default null which equates to false.
* @type array $args Array of arguments to automatically use inside `wp_get_object_terms()`
* for this taxonomy.
* @type bool $_builtin This taxonomy is a "built-in" taxonomy. INTERNAL USE ONLY!
* Default false.
* }
* @return WP_Taxonomy|WP_Error The registered taxonomy object on success, WP_Error object on failure.
*/
function register_taxonomy( $taxonomy, $object_type, $args = array() ) {
global $wp_taxonomies;
if ( ! is_array( $wp_taxonomies ) ) {
$wp_taxonomies = array();
}
$args = wp_parse_args( $args );
if ( empty( $taxonomy ) || strlen( $taxonomy ) > 32 ) {
_doing_it_wrong( __FUNCTION__, __( 'Taxonomy names must be between 1 and 32 characters in length.' ), '4.2.0' );
return new WP_Error( 'taxonomy_length_invalid', __( 'Taxonomy names must be between 1 and 32 characters in length.' ) );
}
$taxonomy_object = new WP_Taxonomy( $taxonomy, $object_type, $args );
$taxonomy_object->add_rewrite_rules();
$wp_taxonomies[ $taxonomy ] = $taxonomy_object;
$taxonomy_object->add_hooks();
// Add default term.
if ( ! empty( $taxonomy_object->default_term ) ) {
$term = term_exists( $taxonomy_object->default_term['name'], $taxonomy );
if ( $term ) {
update_option( 'default_term_' . $taxonomy_object->name, $term['term_id'] );
} else {
$term = wp_insert_term(
$taxonomy_object->default_term['name'],
$taxonomy,
array(
'slug' => sanitize_title( $taxonomy_object->default_term['slug'] ),
'description' => $taxonomy_object->default_term['description'],
)
);
// Update `term_id` in options.
if ( ! is_wp_error( $term ) ) {
update_option( 'default_term_' . $taxonomy_object->name, $term['term_id'] );
}
}
}
/**
* Fires after a taxonomy is registered.
*
* @since 3.3.0
*
* @param string $taxonomy Taxonomy slug.
* @param array|string $object_type Object type or array of object types.
* @param array $args Array of taxonomy registration arguments.
*/
do_action( 'registered_taxonomy', $taxonomy, $object_type, (array) $taxonomy_object );
return $taxonomy_object;
}
/**
* Unregisters a taxonomy.
*
* Can not be used to unregister built-in taxonomies.
*
* @since 4.5.0
*
* @global WP $wp Current WordPress environment instance.
* @global array $wp_taxonomies List of taxonomies.
*
* @param string $taxonomy Taxonomy name.
* @return true|WP_Error True on success, WP_Error on failure or if the taxonomy doesn't exist.
*/
function unregister_taxonomy( $taxonomy ) {
if ( ! taxonomy_exists( $taxonomy ) ) {
return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
}
$taxonomy_object = get_taxonomy( $taxonomy );
// Do not allow unregistering internal taxonomies.
if ( $taxonomy_object->_builtin ) {
return new WP_Error( 'invalid_taxonomy', __( 'Unregistering a built-in taxonomy is not allowed.' ) );
}
global $wp_taxonomies;
$taxonomy_object->remove_rewrite_rules();
$taxonomy_object->remove_hooks();
// Remove custom taxonomy default term option.
if ( ! empty( $taxonomy_object->default_term ) ) {
delete_option( 'default_term_' . $taxonomy_object->name );
}
// Remove the taxonomy.
unset( $wp_taxonomies[ $taxonomy ] );
/**
* Fires after a taxonomy is unregistered.
*
* @since 4.5.0
*
* @param string $taxonomy Taxonomy name.
*/
do_action( 'unregistered_taxonomy', $taxonomy );
return true;
}
/**
* Builds an object with all taxonomy labels out of a taxonomy object.
*
* @since 3.0.0
* @since 4.3.0 Added the `no_terms` label.
* @since 4.4.0 Added the `items_list_navigation` and `items_list` labels.
* @since 4.9.0 Added the `most_used` and `back_to_items` labels.
* @since 5.7.0 Added the `filter_by_item` label.
* @since 5.8.0 Added the `item_link` and `item_link_description` labels.
*
* @param WP_Taxonomy $tax Taxonomy object.
* @return object {
* Taxonomy labels object. The first default value is for non-hierarchical taxonomies
* (like tags) and the second one is for hierarchical taxonomies (like categories).
*
* @type string $name General name for the taxonomy, usually plural. The same
* as and overridden by `$tax->label`. Default 'Tags'/'Categories'.
* @type string $singular_name Name for one object of this taxonomy. Default 'Tag'/'Category'.
* @type string $search_items Default 'Search Tags'/'Search Categories'.
* @type string $popular_items This label is only used for non-hierarchical taxonomies.
* Default 'Popular Tags'.
* @type string $all_items Default 'All Tags'/'All Categories'.
* @type string $parent_item This label is only used for hierarchical taxonomies. Default
* 'Parent Category'.
* @type string $parent_item_colon The same as `parent_item`, but with colon `:` in the end.
* @type string $edit_item Default 'Edit Tag'/'Edit Category'.
* @type string $view_item Default 'View Tag'/'View Category'.
* @type string $update_item Default 'Update Tag'/'Update Category'.
* @type string $add_new_item Default 'Add New Tag'/'Add New Category'.
* @type string $new_item_name Default 'New Tag Name'/'New Category Name'.
* @type string $separate_items_with_commas This label is only used for non-hierarchical taxonomies. Default
* 'Separate tags with commas', used in the meta box.
* @type string $add_or_remove_items This label is only used for non-hierarchical taxonomies. Default
* 'Add or remove tags', used in the meta box when JavaScript
* is disabled.
* @type string $choose_from_most_used This label is only used on non-hierarchical taxonomies. Default
* 'Choose from the most used tags', used in the meta box.
* @type string $not_found Default 'No tags found'/'No categories found', used in
* the meta box and taxonomy list table.
* @type string $no_terms Default 'No tags'/'No categories', used in the posts and media
* list tables.
* @type string $filter_by_item This label is only used for hierarchical taxonomies. Default
* 'Filter by category', used in the posts list table.
* @type string $items_list_navigation Label for the table pagination hidden heading.
* @type string $items_list Label for the table hidden heading.
* @type string $most_used Title for the Most Used tab. Default 'Most Used'.
* @type string $back_to_items Label displayed after a term has been updated.
* @type string $item_link Used in the block editor. Title for a navigation link block variation.
* Default 'Tag Link'/'Category Link'.
* @type string $item_link_description Used in the block editor. Description for a navigation link block
* variation. Default 'A link to a tag'/'A link to a category'.
* }
*/
function get_taxonomy_labels( $tax ) {
$tax->labels = (array) $tax->labels;
if ( isset( $tax->helps ) && empty( $tax->labels['separate_items_with_commas'] ) ) {
$tax->labels['separate_items_with_commas'] = $tax->helps;
}
if ( isset( $tax->no_tagcloud ) && empty( $tax->labels['not_found'] ) ) {
$tax->labels['not_found'] = $tax->no_tagcloud;
}
$nohier_vs_hier_defaults = array(
'name' => array( _x( 'Tags', 'taxonomy general name' ), _x( 'Categories', 'taxonomy general name' ) ),
'singular_name' => array( _x( 'Tag', 'taxonomy singular name' ), _x( 'Category', 'taxonomy singular name' ) ),
'search_items' => array( __( 'Search Tags' ), __( 'Search Categories' ) ),
'popular_items' => array( __( 'Popular Tags' ), null ),
'all_items' => array( __( 'All Tags' ), __( 'All Categories' ) ),
'parent_item' => array( null, __( 'Parent Category' ) ),
'parent_item_colon' => array( null, __( 'Parent Category:' ) ),
'edit_item' => array( __( 'Edit Tag' ), __( 'Edit Category' ) ),
'view_item' => array( __( 'View Tag' ), __( 'View Category' ) ),
'update_item' => array( __( 'Update Tag' ), __( 'Update Category' ) ),
'add_new_item' => array( __( 'Add New Tag' ), __( 'Add New Category' ) ),
'new_item_name' => array( __( 'New Tag Name' ), __( 'New Category Name' ) ),
'separate_items_with_commas' => array( __( 'Separate tags with commas' ), null ),
'add_or_remove_items' => array( __( 'Add or remove tags' ), null ),
'choose_from_most_used' => array( __( 'Choose from the most used tags' ), null ),
'not_found' => array( __( 'No tags found.' ), __( 'No categories found.' ) ),
'no_terms' => array( __( 'No tags' ), __( 'No categories' ) ),
'filter_by_item' => array( null, __( 'Filter by category' ) ),
'items_list_navigation' => array( __( 'Tags list navigation' ), __( 'Categories list navigation' ) ),
'items_list' => array( __( 'Tags list' ), __( 'Categories list' ) ),
/* translators: Tab heading when selecting from the most used terms. */
'most_used' => array( _x( 'Most Used', 'tags' ), _x( 'Most Used', 'categories' ) ),
'back_to_items' => array( __( '← Go to Tags' ), __( '← Go to Categories' ) ),
'item_link' => array(
_x( 'Tag Link', 'navigation link block title' ),
_x( 'Category Link', 'navigation link block description' ),
),
'item_link_description' => array(
_x( 'A link to a tag.', 'navigation link block description' ),
_x( 'A link to a category.', 'navigation link block description' ),
),
);
$nohier_vs_hier_defaults['menu_name'] = $nohier_vs_hier_defaults['name'];
$labels = _get_custom_object_labels( $tax, $nohier_vs_hier_defaults );
$taxonomy = $tax->name;
$default_labels = clone $labels;
/**
* Filters the labels of a specific taxonomy.
*
* The dynamic portion of the hook name, `$taxonomy`, refers to the taxonomy slug.
*
* Possible hook names include:
*
* - `taxonomy_labels_category`
* - `taxonomy_labels_post_tag`
*
* @since 4.4.0
*
* @see get_taxonomy_labels() for the full list of taxonomy labels.
*
* @param object $labels Object with labels for the taxonomy as member variables.
*/
$labels = apply_filters( "taxonomy_labels_{$taxonomy}", $labels );
// Ensure that the filtered labels contain all required default values.
$labels = (object) array_merge( (array) $default_labels, (array) $labels );
return $labels;
}
/**
* Add an already registered taxonomy to an object type.
*
* @since 3.0.0
*
* @global array $wp_taxonomies The registered taxonomies.
*
* @param string $taxonomy Name of taxonomy object.
* @param string $object_type Name of the object type.
* @return bool True if successful, false if not.
*/
function register_taxonomy_for_object_type( $taxonomy, $object_type ) {
global $wp_taxonomies;
if ( ! isset( $wp_taxonomies[ $taxonomy ] ) ) {
return false;
}
if ( ! get_post_type_object( $object_type ) ) {
return false;
}
if ( ! in_array( $object_type, $wp_taxonomies[ $taxonomy ]->object_type, true ) ) {
$wp_taxonomies[ $taxonomy ]->object_type[] = $object_type;
}
// Filter out empties.
$wp_taxonomies[ $taxonomy ]->object_type = array_filter( $wp_taxonomies[ $taxonomy ]->object_type );
/**
* Fires after a taxonomy is registered for an object type.
*
* @since 5.1.0
*
* @param string $taxonomy Taxonomy name.
* @param string $object_type Name of the object type.
*/
do_action( 'registered_taxonomy_for_object_type', $taxonomy, $object_type );
return true;
}
/**
* Remove an already registered taxonomy from an object type.
*
* @since 3.7.0
*
* @global array $wp_taxonomies The registered taxonomies.
*
* @param string $taxonomy Name of taxonomy object.
* @param string $object_type Name of the object type.
* @return bool True if successful, false if not.
*/
function unregister_taxonomy_for_object_type( $taxonomy, $object_type ) {
global $wp_taxonomies;
if ( ! isset( $wp_taxonomies[ $taxonomy ] ) ) {
return false;
}
if ( ! get_post_type_object( $object_type ) ) {
return false;
}
$key = array_search( $object_type, $wp_taxonomies[ $taxonomy ]->object_type, true );
if ( false === $key ) {
return false;
}
unset( $wp_taxonomies[ $taxonomy ]->object_type[ $key ] );
/**
* Fires after a taxonomy is unregistered for an object type.
*
* @since 5.1.0
*
* @param string $taxonomy Taxonomy name.
* @param string $object_type Name of the object type.
*/
do_action( 'unregistered_taxonomy_for_object_type', $taxonomy, $object_type );
return true;
}
//
// Term API.
//
/**
* Retrieve object_ids of valid taxonomy and term.
*
* The strings of $taxonomies must exist before this function will continue.
* On failure of finding a valid taxonomy, it will return a WP_Error class,
* kind of like Exceptions in PHP 5, except you can't catch them. Even so,
* you can still test for the WP_Error class and get the error message.
*
* The $terms aren't checked the same as $taxonomies, but still need to exist
* for $object_ids to be returned.
*
* It is possible to change the order that object_ids is returned by either
* using PHP sort family functions or using the database by using $args with
* either ASC or DESC array. The value should be in the key named 'order'.
*
* @since 2.3.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param int|array $term_ids Term ID or array of term IDs of terms that will be used.
* @param string|array $taxonomies String of taxonomy name or Array of string values of taxonomy names.
* @param array|string $args Change the order of the object_ids, either ASC or DESC.
* @return array|WP_Error An array of $object_ids on success, WP_Error if the taxonomy does not exist.
*/
function get_objects_in_term( $term_ids, $taxonomies, $args = array() ) {
global $wpdb;
if ( ! is_array( $term_ids ) ) {
$term_ids = array( $term_ids );
}
if ( ! is_array( $taxonomies ) ) {
$taxonomies = array( $taxonomies );
}
foreach ( (array) $taxonomies as $taxonomy ) {
if ( ! taxonomy_exists( $taxonomy ) ) {
return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
}
}
$defaults = array( 'order' => 'ASC' );
$args = wp_parse_args( $args, $defaults );
$order = ( 'desc' === strtolower( $args['order'] ) ) ? 'DESC' : 'ASC';
$term_ids = array_map( 'intval', $term_ids );
$taxonomies = "'" . implode( "', '", array_map( 'esc_sql', $taxonomies ) ) . "'";
$term_ids = "'" . implode( "', '", $term_ids ) . "'";
$sql = "SELECT tr.object_id FROM $wpdb->term_relationships AS tr INNER JOIN $wpdb->term_taxonomy AS tt ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN ($taxonomies) AND tt.term_id IN ($term_ids) ORDER BY tr.object_id $order";
$last_changed = wp_cache_get_last_changed( 'terms' );
$cache_key = 'get_objects_in_term:' . md5( $sql ) . ":$last_changed";
$cache = wp_cache_get( $cache_key, 'terms' );
if ( false === $cache ) {
$object_ids = $wpdb->get_col( $sql );
wp_cache_set( $cache_key, $object_ids, 'terms' );
} else {
$object_ids = (array) $cache;
}
if ( ! $object_ids ) {
return array();
}
return $object_ids;
}
/**
* Given a taxonomy query, generates SQL to be appended to a main query.
*
* @since 3.1.0
*
* @see WP_Tax_Query
*
* @param array $tax_query A compact tax query
* @param string $primary_table
* @param string $primary_id_column
* @return array
*/
function get_tax_sql( $tax_query, $primary_table, $primary_id_column ) {
$tax_query_obj = new WP_Tax_Query( $tax_query );
return $tax_query_obj->get_sql( $primary_table, $primary_id_column );
}
/**
* Get all Term data from database by Term ID.
*
* The usage of the get_term function is to apply filters to a term object. It
* is possible to get a term object from the database before applying the
* filters.
*
* $term ID must be part of $taxonomy, to get from the database. Failure, might
* be able to be captured by the hooks. Failure would be the same value as $wpdb
* returns for the get_row method.
*
* There are two hooks, one is specifically for each term, named 'get_term', and
* the second is for the taxonomy name, 'term_$taxonomy'. Both hooks gets the
* term object, and the taxonomy name as parameters. Both hooks are expected to
* return a Term object.
*
* {@see 'get_term'} hook - Takes two parameters the term Object and the taxonomy name.
* Must return term object. Used in get_term() as a catch-all filter for every
* $term.
*
* {@see 'get_$taxonomy'} hook - Takes two parameters the term Object and the taxonomy
* name. Must return term object. $taxonomy will be the taxonomy name, so for
* example, if 'category', it would be 'get_category' as the filter name. Useful
* for custom taxonomies or plugging into default taxonomies.
*
* @todo Better formatting for DocBlock
*
* @since 2.3.0
* @since 4.4.0 Converted to return a WP_Term object if `$output` is `OBJECT`.
* The `$taxonomy` parameter was made optional.
*
* @see sanitize_term_field() The $context param lists the available values for get_term_by() $filter param.
*
* @param int|WP_Term|object $term If integer, term data will be fetched from the database,
* or from the cache if available.
* If stdClass object (as in the results of a database query),
* will apply filters and return a `WP_Term` object with the `$term` data.
* If `WP_Term`, will return `$term`.
* @param string $taxonomy Optional. Taxonomy name that `$term` is part of.
* @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which
* correspond to a WP_Term object, an associative array, or a numeric array,
* respectively. Default OBJECT.
* @param string $filter Optional. How to sanitize term fields. Default 'raw'.
* @return WP_Term|array|WP_Error|null WP_Term instance (or array) on success, depending on the `$output` value.
* WP_Error if `$taxonomy` does not exist. Null for miscellaneous failure.
*/
function get_term( $term, $taxonomy = '', $output = OBJECT, $filter = 'raw' ) {
if ( empty( $term ) ) {
return new WP_Error( 'invalid_term', __( 'Empty Term.' ) );
}
if ( $taxonomy && ! taxonomy_exists( $taxonomy ) ) {
return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
}
if ( $term instanceof WP_Term ) {
$_term = $term;
} elseif ( is_object( $term ) ) {
if ( empty( $term->filter ) || 'raw' === $term->filter ) {
$_term = sanitize_term( $term, $taxonomy, 'raw' );
$_term = new WP_Term( $_term );
} else {
$_term = WP_Term::get_instance( $term->term_id );
}
} else {
$_term = WP_Term::get_instance( $term, $taxonomy );
}
if ( is_wp_error( $_term ) ) {
return $_term;
} elseif ( ! $_term ) {
return null;
}
// Ensure for filters that this is not empty.
$taxonomy = $_term->taxonomy;
/**
* Filters a taxonomy term object.
*
* The {@see 'get_$taxonomy'} hook is also available for targeting a specific
* taxonomy.
*
* @since 2.3.0
* @since 4.4.0 `$_term` is now a `WP_Term` object.
*
* @param WP_Term $_term Term object.
* @param string $taxonomy The taxonomy slug.
*/
$_term = apply_filters( 'get_term', $_term, $taxonomy );
/**
* Filters a taxonomy term object.
*
* The dynamic portion of the filter name, `$taxonomy`, refers
* to the slug of the term's taxonomy.
*
* @since 2.3.0
* @since 4.4.0 `$_term` is now a `WP_Term` object.
*
* @param WP_Term $_term Term object.
* @param string $taxonomy The taxonomy slug.
*/
$_term = apply_filters( "get_{$taxonomy}", $_term, $taxonomy );
// Bail if a filter callback has changed the type of the `$_term` object.
if ( ! ( $_term instanceof WP_Term ) ) {
return $_term;
}
// Sanitize term, according to the specified filter.
$_term->filter( $filter );
if ( ARRAY_A === $output ) {
return $_term->to_array();
} elseif ( ARRAY_N === $output ) {
return array_values( $_term->to_array() );
}
return $_term;
}
/**
* Get all Term data from database by Term field and data.
*
* Warning: $value is not escaped for 'name' $field. You must do it yourself, if
* required.
*
* The default $field is 'id', therefore it is possible to also use null for
* field, but not recommended that you do so.
*
* If $value does not exist, the return value will be false. If $taxonomy exists
* and $field and $value combinations exist, the Term will be returned.
*
* This function will always return the first term that matches the `$field`-
* `$value`-`$taxonomy` combination specified in the parameters. If your query
* is likely to match more than one term (as is likely to be the case when
* `$field` is 'name', for example), consider using get_terms() instead; that
* way, you will get all matching terms, and can provide your own logic for
* deciding which one was intended.
*
* @todo Better formatting for DocBlock.
*
* @since 2.3.0
* @since 4.4.0 `$taxonomy` is optional if `$field` is 'term_taxonomy_id'. Converted to return
* a WP_Term object if `$output` is `OBJECT`.
* @since 5.5.0 Added 'ID' as an alias of 'id' for the `$field` parameter.
*
* @see sanitize_term_field() The $context param lists the available values for get_term_by() $filter param.
*
* @param string $field Either 'slug', 'name', 'id' or 'ID' (term_id), or 'term_taxonomy_id'.
* @param string|int $value Search for this term value.
* @param string $taxonomy Taxonomy name. Optional, if `$field` is 'term_taxonomy_id'.
* @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which
* correspond to a WP_Term object, an associative array, or a numeric array,
* respectively. Default OBJECT.
* @param string $filter Optional. How to sanitize term fields. Default 'raw'.
* @return WP_Term|array|false WP_Term instance (or array) on success, depending on the `$output` value.
* False if `$taxonomy` does not exist or `$term` was not found.
*/
function get_term_by( $field, $value, $taxonomy = '', $output = OBJECT, $filter = 'raw' ) {
// 'term_taxonomy_id' lookups don't require taxonomy checks.
if ( 'term_taxonomy_id' !== $field && ! taxonomy_exists( $taxonomy ) ) {
return false;
}