<?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,

			),

			'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.

 *

 *                                                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`.

 *         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          $_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.