<?php

/**

* Taxonomy API

*

* @package WordPress

* @subpackage Taxonomy

* @since 2.3.0

*/

//

// Taxonomy Registration

//

/**

* Creates the initial taxonomies.

*

* This function fires twice: in wp-settings.php before plugins are loaded (for

* backwards compatibility reasons), and again on the 'init' action. We must avoid

* registering rewrite rules before the 'init' action.

*/

function create_initial_taxonomies() {

global $wp_rewrite;

if ( ! did_action( 'init' ) ) {

$rewrite = array( 'category' => false, 'post_tag' => false, 'post_format' => false );

} else {

$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(

'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,

'_builtin' => true,

) );

register_taxonomy( 'post_tag', 'post', array(

'hierarchical' => false,

'query_var' => 'tag',

'rewrite' => $rewrite['post_tag'],

'public' => true,

'show_ui' => true,

'_builtin' => true,

) );

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,

),

'query_var' => false,

'rewrite' => false,

'public' => false,

'show_ui' => false,

'_builtin' => true,

) );

register_taxonomy( 'post_format', 'post', array(

'public' => true,

'hierarchical' => false,

'labels' => array(

'name' => _x( 'Format', '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' ),

) );

}

add_action( 'init', 'create_initial_taxonomies', 0 ); // highest priority

/**

* Get a list of registered taxonomy objects.

*

* @package WordPress

* @subpackage Taxonomy

* @since 3.0.0

* @uses $wp_taxonomies

* @see register_taxonomy

*

* @param array $args An array of key => value arguments to match against the taxonomy objects.

* @param string $output The type of output to return, either taxonomy 'names' or 'objects'. 'names' is the default.

* @param string $operator The logical operation to perform. 'or' means only one element

* from the array needs to match; 'and' means all elements must match. The default is 'and'.

* @return array A list 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 all of the taxonomy names that are of $object_type.

*

* It appears that this function can be used to find all of the names inside of

* $wp_taxonomies global variable.

*

* <code><?php $taxonomies = get_object_taxonomies('post'); ?></code> Should

* result in <code>Array('category', 'post_tag')</code>

*

* @package WordPress

* @subpackage Taxonomy

* @since 2.3.0

*

* @uses $wp_taxonomies

*

* @param array|string|object $object Name of the type of taxonomy object, or an object (row from posts)

* @param string $output The type of output to return, either taxonomy 'names' or 'objects'. 'names' is the default.

* @return array The names of all taxonomy of $object_type.

*/

function get_object_taxonomies($object, $output = 'names') {

global $wp_taxonomies;

if ( is_object($object) ) {

if ( $object->post_type == 'attachment' )

return get_attachment_taxonomies($object);

$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.

*

* @package WordPress

* @subpackage Taxonomy

* @since 2.3.0

*

* @uses $wp_taxonomies

* @uses taxonomy_exists() Checks whether taxonomy exists

*

* @param string $taxonomy Name of taxonomy object to return

* @return object|bool 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];

}

/**

* Checks that the taxonomy name exists.

*

* Formerly is_taxonomy(), introduced in 2.3.0.

*

* @package WordPress

* @subpackage Taxonomy

* @since 3.0.0

*

* @uses $wp_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] );

}

/**

* 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.

*

* @package WordPress

* @subpackage Taxonomy

* @since 2.3.0

*

* @uses taxonomy_exists() Checks whether taxonomy exists

* @uses get_taxonomy() Used to get the taxonomy object

*

* @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;

}

/**

* Create or modify a taxonomy object. Do not use before init.

*

* A simple function for creating or modifying a taxonomy object based on the

* parameters given. The function will accept an array (third optional

* parameter), along with strings for the taxonomy name and another string for

* the object type.

*

* Nothing is returned, so expect error maybe or use taxonomy_exists() to check

* whether taxonomy exists.

*

* Optional $args contents:

*

* label - Name of the taxonomy shown in the menu. Usually plural. If not set, labels['name'] will be used.

*

* hierarchical - has some defined purpose at other parts of the API and is a

* boolean value.

*

* update_count_callback - works much like a hook, in that it will be called when the count is updated.

* Defaults to _update_post_term_count() for taxonomies attached to post types, which then confirms

* that the objects are published before counting them.

* Defaults to _update_generic_term_count() for taxonomies attached to other object types, such as links.

*

* rewrite - false to prevent rewrite, or array('slug'=>$slug) to customize

* permastruct; default will use $taxonomy as slug.

*

* query_var - false to prevent queries, or string to customize query var

* (?$query_var=$term); default will use $taxonomy as query var.

*

* public - If the taxonomy should be publicly queryable; //@TODO not implemented.

* defaults to true.

*

* show_ui - If the WordPress UI admin tags UI should apply to this taxonomy;

* defaults to public.

*

* show_in_nav_menus - true makes this taxonomy available for selection in navigation menus.

* Defaults to public.

*

* show_tagcloud - false to prevent the taxonomy being listed in the Tag Cloud Widget;

* defaults to show_ui which defaults to public.

*

* labels - An array of labels for this taxonomy. You can see accepted values in {@link get_taxonomy_labels()}. By default tag labels are used for non-hierarchical types and category labels for hierarchical ones.

*

* @package WordPress

* @subpackage Taxonomy

* @since 2.3.0

* @uses $wp_taxonomies Inserts new taxonomy object into the list

* @uses $wp Adds query vars

*

* @param string $taxonomy Name of taxonomy object

* @param array|string $object_type Name of the object type for the taxonomy object.

* @param array|string $args See above description for the two keys values.

*/

function register_taxonomy( $taxonomy, $object_type, $args = array() ) {

global $wp_taxonomies, $wp;

if ( ! is_array($wp_taxonomies) )

$wp_taxonomies = array();

$defaults = array( 'hierarchical' => false,

'update_count_callback' => '',

'rewrite' => true,

'query_var' => $taxonomy,

'public' => true,

'show_ui' => null,

'show_tagcloud' => null,

'_builtin' => false,

'labels' => array(),

'capabilities' => array(),

'show_in_nav_menus' => null,

);

$args = wp_parse_args($args, $defaults);

if ( false !== $args['query_var'] && !empty($wp) ) {

if ( true === $args['query_var'] )

$args['query_var'] = $taxonomy;

$args['query_var'] = sanitize_title_with_dashes($args['query_var']);

$wp->add_query_var($args['query_var']);

}

if ( false !== $args['rewrite'] && ( is_admin() || '' != get_option('permalink_structure') ) ) {

$args['rewrite'] = wp_parse_args($args['rewrite'], array(

'slug' => sanitize_title_with_dashes($taxonomy),

'with_front' => true,

'hierarchical' => false,

'ep_mask' => EP_NONE,

));

if ( $args['hierarchical'] && $args['rewrite']['hierarchical'] )

$tag = '(.+?)';

else

$tag = '([^/]+)';

add_rewrite_tag( "%$taxonomy%", $tag, $args['query_var'] ? "{$args['query_var']}=" : "taxonomy=$taxonomy&term=" );

add_permastruct( $taxonomy, "{$args['rewrite']['slug']}/%$taxonomy%", $args['rewrite'] );

}

if ( is_null($args['show_ui']) )

$args['show_ui'] = $args['public'];

// Whether to show this type in nav-menus.php. Defaults to the setting for public.

if ( null === $args['show_in_nav_menus'] )

$args['show_in_nav_menus'] = $args['public'];

if ( is_null($args['show_tagcloud']) )

$args['show_tagcloud'] = $args['show_ui'];

$default_caps = array(

'manage_terms' => 'manage_categories',

'edit_terms' => 'manage_categories',

'delete_terms' => 'manage_categories',

'assign_terms' => 'edit_posts',

);

$args['cap'] = (object) array_merge( $default_caps, $args['capabilities'] );

unset( $args['capabilities'] );

$args['name'] = $taxonomy;

$args['object_type'] = array_unique( (array)$object_type );

$args['labels'] = get_taxonomy_labels( (object) $args );

$args['label'] = $args['labels']->name;

$wp_taxonomies[$taxonomy] = (object) $args;

// register callback handling for metabox

add_filter('wp_ajax_add-' . $taxonomy, '_wp_ajax_add_hierarchical_term');

do_action( 'registered_taxonomy', $taxonomy, $object_type, $args );

}

/**

* Builds an object with all taxonomy labels out of a taxonomy object

*

* Accepted keys of the label array in the taxonomy object:

* - name - general name for the taxonomy, usually plural. The same as and overridden by $tax->label. Default is Tags/Categories

* - singular_name - name for one object of this taxonomy. Default is Tag/Category

* - search_items - Default is Search Tags/Search Categories

* - popular_items - This string isn't used on hierarchical taxonomies. Default is Popular Tags

* - all_items - Default is All Tags/All Categories

* - parent_item - This string isn't used on non-hierarchical taxonomies. In hierarchical ones the default is Parent Category

* - parent_item_colon - The same as <code>parent_item</code>, but with colon <code>:</code> in the end

* - edit_item - Default is Edit Tag/Edit Category

* - view_item - Default is View Tag/View Category

* - update_item - Default is Update Tag/Update Category

* - add_new_item - Default is Add New Tag/Add New Category

* - new_item_name - Default is New Tag Name/New Category Name

* - separate_items_with_commas - This string isn't used on hierarchical taxonomies. Default is "Separate tags with commas", used in the meta box.

* - add_or_remove_items - This string isn't used on hierarchical taxonomies. Default is "Add or remove tags", used in the meta box when JavaScript is disabled.

* - choose_from_most_used - This string isn't used on hierarchical taxonomies. Default is "Choose from the most used tags", used in the meta box.

*

* Above, the first default value is for non-hierarchical taxonomies (like tags) and the second one is for hierarchical taxonomies (like categories).

*

* @since 3.0.0

* @param object $tax Taxonomy object

* @return object object with all the labels as member variables

*/

function get_taxonomy_labels( $tax ) {

if ( isset( $tax->helps ) && empty( $tax->labels['separate_items_with_commas'] ) )

$tax->labels['separate_items_with_commas'] = $tax->helps;

$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 ),

);

$nohier_vs_hier_defaults['menu_name'] = $nohier_vs_hier_defaults['name'];

return _get_custom_object_labels( $tax, $nohier_vs_hier_defaults );

}

/**

* Add an already registered taxonomy to an object type.

*

* @package WordPress

* @subpackage Taxonomy

* @since 3.0.0

* @uses $wp_taxonomies Modifies taxonomy object

*

* @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 ) )

$wp_taxonomies[$taxonomy]->object_type[] = $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 an 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'.

*

* @package WordPress

* @subpackage Taxonomy

* @since 2.3.0

*

* @uses $wpdb

* @uses wp_parse_args() Creates an array from string $args.

*

* @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 WP_Error|array If the taxonomy does not exist, then WP_Error will be returned. On success

* the array can be empty meaning that there are no $object_ids found or it will return the $object_ids found.

*/

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 );

extract( $args, EXTR_SKIP );

$order = ( 'desc' == strtolower( $order ) ) ? 'DESC' : 'ASC';

$term_ids = array_map('intval', $term_ids );

$taxonomies = "'" . implode( "', '", $taxonomies ) . "'";

$term_ids = "'" . implode( "', '", $term_ids ) . "'";

$object_ids = $wpdb->get_col("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");

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 );

}

/**

* Container class for a multiple taxonomy query.

*

* @since 3.1.0

*/

class WP_Tax_Query {

/**

* List of taxonomy queries. A single taxonomy query is an associative array:

* - 'taxonomy' string The taxonomy being queried

* - 'terms' string|array The list of terms

* - 'field' string (optional) Which term field is being used.

* Possible values: 'term_id', 'slug' or 'name'

* Default: 'term_id'

* - 'operator' string (optional)

* Possible values: 'AND', 'IN' or 'NOT IN'.

* Default: 'IN'

* - 'include_children' bool (optional) Whether to include child terms.

* Default: true

*

* @since 3.1.0

* @access public

* @var array

*/

public $queries = array();

/**

* The relation between the queries. Can be one of 'AND' or 'OR'.

*

* @since 3.1.0

* @access public

* @var string

*/

public $relation;

/**

* Standard response when the query should not return any rows.

*

* @since 3.2.0

* @access private

* @var string

*/

private static $no_results = array( 'join' => '', 'where' => ' AND 0 = 1' );

/**

* Constructor.

*

* Parses a compact tax query and sets defaults.

*

* @since 3.1.0

* @access public

*

* @param array $tax_query A compact tax query:

* array(

* 'relation' => 'OR',

* array(

* 'taxonomy' => 'tax1',

* 'terms' => array( 'term1', 'term2' ),

* 'field' => 'slug',

* ),

* array(

* 'taxonomy' => 'tax2',

* 'terms' => array( 'term-a', 'term-b' ),

* 'field' => 'slug',

* ),

* )

*/

public function __construct( $tax_query ) {

if ( isset( $tax_query['relation'] ) && strtoupper( $tax_query['relation'] ) == 'OR' ) {

$this->relation = 'OR';

} else {

$this->relation = 'AND';

}

$defaults = array(

'taxonomy' => '',

'terms' => array(),

'include_children' => true,

'field' => 'term_id',

'operator' => 'IN',

);

foreach ( $tax_query as $query ) {

if ( ! is_array( $query ) )

continue;

$query = array_merge( $defaults, $query );

$query['terms'] = (array) $query['terms'];

$this->queries[] = $query;

}

}

/**

* Generates SQL clauses to be appended to a main query.

*

* @since 3.1.0

* @access public

*

* @param string $primary_table

* @param string $primary_id_column

* @return array

*/

public function get_sql( $primary_table, $primary_id_column ) {

global $wpdb;

$join = '';

$where = array();

$i = 0;

foreach ( $this->queries as $query ) {

$this->clean_query( $query );

if ( is_wp_error( $query ) ) {

return self::$no_results;

}

extract( $query );

if ( 'IN' == $operator ) {

if ( empty( $terms ) ) {

if ( 'OR' == $this->relation )

continue;

else

return self::$no_results;

}

$terms = implode( ',', $terms );

$alias = $i ? 'tt' . $i : $wpdb->term_relationships;

$join .= " INNER JOIN $wpdb->term_relationships";

$join .= $i ? " AS $alias" : '';

$join .= " ON ($primary_table.$primary_id_column = $alias.object_id)";

$where[] = "$alias.term_taxonomy_id $operator ($terms)";

} elseif ( 'NOT IN' == $operator ) {

if ( empty( $terms ) )

continue;

$terms = implode( ',', $terms );

$where[] = "$primary_table.$primary_id_column NOT IN (

SELECT object_id

FROM $wpdb->term_relationships

WHERE term_taxonomy_id IN ($terms)

)";

} elseif ( 'AND' == $operator ) {

if ( empty( $terms ) )

continue;

$num_terms = count( $terms );

$terms = implode( ',', $terms );

$where[] = "(

SELECT COUNT(1)

FROM $wpdb->term_relationships

WHERE term_taxonomy_id IN ($terms)

AND object_id = $primary_table.$primary_id_column

) = $num_terms";

}

$i++;

}

if ( !empty( $where ) )

$where = ' AND ( ' . implode( " $this->relation ", $where ) . ' )';

else

$where = '';

return compact( 'join', 'where' );

}

/**

* Validates a single query.

*

* @since 3.2.0

* @access private

*

* @param array &$query The single query

*/

private function clean_query( &$query ) {

if ( ! taxonomy_exists( $query['taxonomy'] ) ) {

$query = new WP_Error( 'Invalid taxonomy' );

return;

}

$query['terms'] = array_unique( (array) $query['terms'] );

if ( is_taxonomy_hierarchical( $query['taxonomy'] ) && $query['include_children'] ) {

$this->transform_query( $query, 'term_id' );

if ( is_wp_error( $query ) )

return;

$children = array();

foreach ( $query['terms'] as $term ) {

$children = array_merge( $children, get_term_children( $term, $query['taxonomy'] ) );

$children[] = $term;

}

$query['terms'] = $children;

}

$this->transform_query( $query, 'term_taxonomy_id' );

}

/**

* Transforms a single query, from one field to another.

*

* @since 3.2.0

* @access private

*

* @param array &$query The single query

* @param string $resulting_field The resulting field

*/

private function transform_query( &$query, $resulting_field ) {

global $wpdb;

if ( empty( $query['terms'] ) )

return;

if ( $query['field'] == $resulting_field )

return;

$resulting_field = esc_sql( $resulting_field );

switch ( $query['field'] ) {

case 'slug':

case 'name':

$terms = "'" . implode( "','", array_map( 'sanitize_title_for_query', $query['terms'] ) ) . "'";

$terms = $wpdb->get_col( "

SELECT $wpdb->term_taxonomy.$resulting_field

FROM $wpdb->term_taxonomy

INNER JOIN $wpdb->terms USING (term_id)

WHERE taxonomy = '{$query['taxonomy']}'

AND $wpdb->terms.{$query['field']} IN ($terms)

" );

break;

default:

$terms = implode( ',', array_map( 'intval', $query['terms'] ) );

$terms = $wpdb->get_col( "

SELECT $resulting_field

FROM $wpdb->term_taxonomy

WHERE taxonomy = '{$query['taxonomy']}'

AND term_id IN ($terms)

" );

}

if ( 'AND' == $query['operator'] && count( $terms ) < count( $query['terms'] ) ) {

$query = new WP_Error( 'Inexistent terms' );

return;

}

$query['terms'] = $terms;

$query['field'] = $resulting_field;

}

}

/**

* 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.

*

* '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.

*

* '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.

*

* @package WordPress

* @subpackage Taxonomy

* @since 2.3.0

*

* @uses $wpdb

* @uses sanitize_term() Cleanses the term based on $filter context before returning.

* @see sanitize_term_field() The $context param lists the available values for get_term_by() $filter param.

*

* @param int|object $term If integer, will get from database. If object will apply filters and return $term.

* @param string $taxonomy Taxonomy name that $term is part of.

* @param string $output Constant OBJECT, ARRAY_A, or ARRAY_N

* @param string $filter Optional, default is raw or no WordPress defined filter will applied.

* @return mixed|null|WP_Error Term Row from database. Will return null if $term is empty. If taxonomy does not

* exist then WP_Error will be returned.

*/

function &get_term($term, $taxonomy, $output = OBJECT, $filter = 'raw') {

global $wpdb;

$null = null;

if ( empty($term) ) {

$error = new WP_Error('invalid_term', __('Empty Term'));

return $error;

}

if ( ! taxonomy_exists($taxonomy) ) {

$error = new WP_Error('invalid_taxonomy', __('Invalid taxonomy'));

return $error;

}

if ( is_object($term) && empty($term->filter) ) {

wp_cache_add($term->term_id, $term, $taxonomy);

$_term = $term;

} else {

if ( is_object($term) )

$term = $term->term_id;

if ( !$term = (int) $term )

return $null;

if ( ! $_term = wp_cache_get($term, $taxonomy) ) {

$_term = $wpdb->get_row( $wpdb->prepare( "SELECT t.*, tt.* FROM $wpdb->terms AS t INNER JOIN $wpdb->term_taxonomy AS tt ON t.term_id = tt.term_id WHERE tt.taxonomy = %s AND t.term_id = %d LIMIT 1", $taxonomy, $term) );

if ( ! $_term )

return $null;

wp_cache_add($term, $_term, $taxonomy);

}

}

$_term = apply_filters('get_term', $_term, $taxonomy);

$_term = apply_filters("get_$taxonomy", $_term, $taxonomy);

$_term = sanitize_term($_term, $taxonomy, $filter);

if ( $output == OBJECT ) {

return $_term;

} elseif ( $output == ARRAY_A ) {

$__term = get_object_vars($_term);

return $__term;

} elseif ( $output == ARRAY_N ) {

$__term = array_values(get_object_vars($_term));

return $__term;

} else {

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.

*

* @package WordPress

* @subpackage Taxonomy

* @since 2.3.0

*

* @uses $wpdb

* @uses sanitize_term() Cleanses the term based on $filter context before returning.

* @see sanitize_term_field() The $context param lists the available values for get_term_by() $filter param.

*

* @param string $field Either 'slug', 'name', or 'id'

* @param string|int $value Search for this term value

* @param string $taxonomy Taxonomy Name

* @param string $output Constant OBJECT, ARRAY_A, or ARRAY_N

* @param string $filter Optional, default is raw or no WordPress defined filter will applied.

* @return mixed Term Row from database. Will return false if $taxonomy does not exist or $term was not found.

*/

function get_term_by($field, $value, $taxonomy, $output = OBJECT, $filter = 'raw') {

global $wpdb;

if ( ! taxonomy_exists($taxonomy) )

return false;

if ( 'slug' == $field ) {

$field = 't.slug';

$value = sanitize_title($value);

if ( empty($value) )

return false;

} else if ( 'name' == $field ) {

// Assume already escaped

$value = stripslashes($value);

$field = 't.name';

} else {

$term = get_term( (int) $value, $taxonomy, $output, $filter);

if ( is_wp_error( $term ) )

$term = false;

return $term;

}

$term = $wpdb->get_row( $wpdb->prepare( "SELECT t.*, tt.* FROM $wpdb->terms AS t INNER JOIN $wpdb->term_taxonomy AS tt ON t.term_id = tt.term_id WHERE tt.taxonomy = %s AND $field = %s LIMIT 1", $taxonomy, $value) );

if ( !$term )

return false;

wp_cache_add($term->term_id, $term, $taxonomy);

$term = apply_filters('get_term', $term, $taxonomy);

$term = apply_filters("get_$taxonomy", $term, $taxonomy);

$term = sanitize_term($term, $taxonomy, $filter);

if ( $output == OBJECT ) {

return $term;

} elseif ( $output == ARRAY_A ) {

return get_object_vars($term);

} elseif ( $output == ARRAY_N ) {

return array_values(get_object_vars($term));

} else {

return $term;

}

}

/**

* Merge all term children into a single array of their IDs.

*

* This recursive function will merge all of the children of $term into the same

* array of term IDs. Only useful for taxonomies which are hierarchical.

*

* Will return an empty array if $term does not exist in $taxonomy.

*

* @package WordPress

* @subpackage Taxonomy

* @since 2.3.0

*

* @uses $wpdb

* @uses _get_term_hierarchy()

* @uses get_term_children() Used to get the children of both $taxonomy and the parent $term

*

* @param string $term_id ID of Term to get children

* @param string $taxonomy Taxonomy Name

* @return array|WP_Error List of Term Objects. WP_Error returned if $taxonomy does not exist

*/

function get_term_children( $term_id, $taxonomy ) {

if ( ! taxonomy_exists($taxonomy) )

return new WP_Error('invalid_taxonomy', __('Invalid taxonomy'));

$term_id = intval( $term_id );

$terms = _get_term_hierarchy($taxonomy);

if ( ! isset($terms[$term_id]) )

return array();

$children = $terms[$term_id];

foreach ( (array) $terms[$term_id] as $child ) {

if ( isset($terms[$child]) )

$children = array_merge($children, get_term_children($child, $taxonomy));