--- /dev/null
+<?php
+
+/**
+ * Taxonomy API: WP_Term_Query class.
+ *
+ * @package WordPress
+ * @subpackage Taxonomy
+ * @since 4.6.0
+ */
+
+/**
+ * Class used for querying terms.
+ *
+ * @since 4.6.0
+ *
+ * @see WP_Term_Query::__construct() for accepted arguments.
+ */
+class WP_Term_Query {
+
+ /**
+ * SQL string used to perform database query.
+ *
+ * @since 4.6.0
+ * @access public
+ * @var string
+ */
+ public $request;
+
+ /**
+ * Metadata query container.
+ *
+ * @since 4.6.0
+ * @access public
+ * @var object WP_Meta_Query
+ */
+ public $meta_query = false;
+
+ /**
+ * Metadata query clauses.
+ *
+ * @since 4.6.0
+ * @access protected
+ * @var array
+ */
+ protected $meta_query_clauses;
+
+ /**
+ * SQL query clauses.
+ *
+ * @since 4.6.0
+ * @access protected
+ * @var array
+ */
+ protected $sql_clauses = array(
+ 'select' => '',
+ 'from' => '',
+ 'where' => array(),
+ 'orderby' => '',
+ 'limits' => '',
+ );
+
+ /**
+ * Query vars set by the user.
+ *
+ * @since 4.6.0
+ * @access public
+ * @var array
+ */
+ public $query_vars;
+
+ /**
+ * Default values for query vars.
+ *
+ * @since 4.6.0
+ * @access public
+ * @var array
+ */
+ public $query_var_defaults;
+
+ /**
+ * List of terms located by the query.
+ *
+ * @since 4.6.0
+ * @access public
+ * @var array
+ */
+ public $terms;
+
+ /**
+ * Constructor.
+ *
+ * Sets up the term query, based on the query vars passed.
+ *
+ * @since 4.6.0
+ * @since 4.6.0 Introduced 'term_taxonomy_id' parameter.
+ * @access public
+ *
+ * @param string|array $query {
+ * Optional. Array or query string of term query parameters. Default empty.
+ *
+ * @type string|array $taxonomy Taxonomy name, or array of taxonomies, to which results should
+ * be limited.
+ * @type string $orderby Field(s) to order terms by. Accepts term fields ('name',
+ * 'slug', 'term_group', 'term_id', 'id', 'description'),
+ * 'count' for term taxonomy count, 'include' to match the
+ * 'order' of the $include param, 'meta_value', 'meta_value_num',
+ * the value of `$meta_key`, the array keys of `$meta_query`, or
+ * 'none' to omit the ORDER BY clause. Defaults to 'name'.
+ * @type string $order Whether to order terms in ascending or descending order.
+ * Accepts 'ASC' (ascending) or 'DESC' (descending).
+ * Default 'ASC'.
+ * @type bool|int $hide_empty Whether to hide terms not assigned to any posts. Accepts
+ * 1|true or 0|false. Default 1|true.
+ * @type array|string $include Array or comma/space-separated string of term ids to include.
+ * Default empty array.
+ * @type array|string $exclude Array or comma/space-separated string of term ids to exclude.
+ * If $include is non-empty, $exclude is ignored.
+ * Default empty array.
+ * @type array|string $exclude_tree Array or comma/space-separated string of term ids to exclude
+ * along with all of their descendant terms. If $include is
+ * non-empty, $exclude_tree is ignored. Default empty array.
+ * @type int|string $number Maximum number of terms to return. Accepts ''|0 (all) or any
+ * positive number. Default ''|0 (all).
+ * @type int $offset The number by which to offset the terms query. Default empty.
+ * @type string $fields Term fields to query for. Accepts 'all' (returns an array of
+ * complete term objects), 'ids' (returns an array of ids),
+ * 'id=>parent' (returns an associative array with ids as keys,
+ * parent term IDs as values), 'names' (returns an array of term
+ * names), 'count' (returns the number of matching terms),
+ * 'id=>name' (returns an associative array with ids as keys,
+ * term names as values), or 'id=>slug' (returns an associative
+ * array with ids as keys, term slugs as values). Default 'all'.
+ * @type bool $count Whether to return a term count (true) or array of term objects
+ * (false). Will take precedence over `$fields` if true.
+ * Default false.
+ * @type string|array $name Optional. Name or array of names to return term(s) for.
+ * Default empty.
+ * @type string|array $slug Optional. Slug or array of slugs to return term(s) for.
+ * Default empty.
+ * @type int|array $term_taxonomy_id Optional. Term taxonomy ID, or array of term taxonomy IDs,
+ * to match when querying terms.
+ * @type bool $hierarchical Whether to include terms that have non-empty descendants (even
+ * if $hide_empty is set to true). Default true.
+ * @type string $search Search criteria to match terms. Will be SQL-formatted with
+ * wildcards before and after. Default empty.
+ * @type string $name__like Retrieve terms with criteria by which a term is LIKE
+ * `$name__like`. Default empty.
+ * @type string $description__like Retrieve terms where the description is LIKE
+ * `$description__like`. Default empty.
+ * @type bool $pad_counts Whether to pad the quantity of a term's children in the
+ * quantity of each term's "count" object variable.
+ * Default false.
+ * @type string $get Whether to return terms regardless of ancestry or whether the
+ * terms are empty. Accepts 'all' or empty (disabled).
+ * Default empty.
+ * @type int $child_of Term ID to retrieve child terms of. If multiple taxonomies
+ * are passed, $child_of is ignored. Default 0.
+ * @type int|string $parent Parent term ID to retrieve direct-child terms of.
+ * Default empty.
+ * @type bool $childless True to limit results to terms that have no children.
+ * This parameter has no effect on non-hierarchical taxonomies.
+ * Default false.
+ * @type string $cache_domain Unique cache key to be produced when this query is stored in
+ * an object cache. Default is 'core'.
+ * @type bool $update_term_meta_cache Whether to prime meta caches for matched terms. Default true.
+ * @type array $meta_query Optional. Meta query clauses to limit retrieved terms by.
+ * See `WP_Meta_Query`. Default empty.
+ * @type string $meta_key Limit terms to those matching a specific metadata key.
+ * Can be used in conjunction with `$meta_value`.
+ * @type string $meta_value Limit terms to those matching a specific metadata value.
+ * Usually used in conjunction with `$meta_key`.
+ * }
+ */
+ public function __construct( $query = '' ) {
+ $this->query_var_defaults = array(
+ 'taxonomy' => null,
+ 'orderby' => 'name',
+ 'order' => 'ASC',
+ 'hide_empty' => true,
+ 'include' => array(),
+ 'exclude' => array(),
+ 'exclude_tree' => array(),
+ 'number' => '',
+ 'offset' => '',
+ 'fields' => 'all',
+ 'count' => false,
+ 'name' => '',
+ 'slug' => '',
+ 'term_taxonomy_id' => '',
+ 'hierarchical' => true,
+ 'search' => '',
+ 'name__like' => '',
+ 'description__like' => '',
+ 'pad_counts' => false,
+ 'get' => '',
+ 'child_of' => 0,
+ 'parent' => '',
+ 'childless' => false,
+ 'cache_domain' => 'core',
+ 'update_term_meta_cache' => true,
+ 'meta_query' => '',
+ );
+
+ if ( ! empty( $query ) ) {
+ $this->query( $query );
+ }
+ }
+
+ /**
+ * Parse arguments passed to the term query with default query parameters.
+ *
+ * @since 4.6.0
+ * @access public
+ *
+ * @param string|array $query WP_Term_Query arguments. See WP_Term_Query::__construct()
+ */
+ public function parse_query( $query = '' ) {
+ if ( empty( $query ) ) {
+ $query = $this->query_vars;
+ }
+
+ $taxonomies = isset( $query['taxonomy'] ) ? (array) $query['taxonomy'] : null;
+
+ /**
+ * Filters the terms query default arguments.
+ *
+ * Use {@see 'get_terms_args'} to filter the passed arguments.
+ *
+ * @since 4.4.0
+ *
+ * @param array $defaults An array of default get_terms() arguments.
+ * @param array $taxonomies An array of taxonomies.
+ */
+ $this->query_var_defaults = apply_filters( 'get_terms_defaults', $this->query_var_defaults, $taxonomies );
+
+ $query = wp_parse_args( $query, $this->query_var_defaults );
+
+ $query['number'] = absint( $query['number'] );
+ $query['offset'] = absint( $query['offset'] );
+
+ // 'parent' overrides 'child_of'.
+ if ( 0 < intval( $query['parent'] ) ) {
+ $query['child_of'] = false;
+ }
+
+ if ( 'all' == $query['get'] ) {
+ $query['childless'] = false;
+ $query['child_of'] = 0;
+ $query['hide_empty'] = 0;
+ $query['hierarchical'] = false;
+ $query['pad_counts'] = false;
+ }
+
+ $query['taxonomy'] = $taxonomies;
+
+ /**
+ * Filters the terms query arguments.
+ *
+ * @since 3.1.0
+ *
+ * @param array $args An array of get_terms() arguments.
+ * @param array $taxonomies An array of taxonomies.
+ */
+ $this->query_vars = apply_filters( 'get_terms_args', $query, $taxonomies );
+
+ /**
+ * Fires after term query vars have been parsed.
+ *
+ * @since 4.6.0
+ *
+ * @param WP_Term_Query $this Current instance of WP_Term_Query.
+ */
+ do_action( 'parse_term_query', $this );
+ }
+
+ /**
+ * Sets up the query for retrieving terms.
+ *
+ * @since 4.6.0
+ * @access public
+ *
+ * @param string|array $query Array or URL query string of parameters.
+ * @return array|int List of terms, or number of terms when 'count' is passed as a query var.
+ */
+ public function query( $query ) {
+ $this->query_vars = wp_parse_args( $query );
+ return $this->get_terms();
+ }
+
+ /**
+ * Get terms, based on query_vars.
+ *
+ * @param 4.6.0
+ * @access public
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @return array
+ */
+ public function get_terms() {
+ global $wpdb;
+
+ $this->parse_query( $this->query_vars );
+ $args = $this->query_vars;
+
+ // Set up meta_query so it's available to 'pre_get_terms'.
+ $this->meta_query = new WP_Meta_Query();
+ $this->meta_query->parse_query_vars( $args );
+
+ /**
+ * Fires before terms are retrieved.
+ *
+ * @since 4.6.0
+ *
+ * @param WP_Term_Query $this Current instance of WP_Term_Query.
+ */
+ do_action( 'pre_get_terms', $this );
+
+ $taxonomies = $args['taxonomy'];
+
+ // Save queries by not crawling the tree in the case of multiple taxes or a flat tax.
+ $has_hierarchical_tax = false;
+ if ( $taxonomies ) {
+ foreach ( $taxonomies as $_tax ) {
+ if ( is_taxonomy_hierarchical( $_tax ) ) {
+ $has_hierarchical_tax = true;
+ }
+ }
+ }
+
+ if ( ! $has_hierarchical_tax ) {
+ $args['hierarchical'] = false;
+ $args['pad_counts'] = false;
+ }
+
+ // 'parent' overrides 'child_of'.
+ if ( 0 < intval( $args['parent'] ) ) {
+ $args['child_of'] = false;
+ }
+
+ if ( 'all' == $args['get'] ) {
+ $args['childless'] = false;
+ $args['child_of'] = 0;
+ $args['hide_empty'] = 0;
+ $args['hierarchical'] = false;
+ $args['pad_counts'] = false;
+ }
+
+ /**
+ * Filters the terms query arguments.
+ *
+ * @since 3.1.0
+ *
+ * @param array $args An array of get_terms() arguments.
+ * @param array $taxonomies An array of taxonomies.
+ */
+ $args = apply_filters( 'get_terms_args', $args, $taxonomies );
+
+ // Avoid the query if the queried parent/child_of term has no descendants.
+ $child_of = $args['child_of'];
+ $parent = $args['parent'];
+
+ if ( $child_of ) {
+ $_parent = $child_of;
+ } elseif ( $parent ) {
+ $_parent = $parent;
+ } else {
+ $_parent = false;
+ }
+
+ if ( $_parent ) {
+ $in_hierarchy = false;
+ foreach ( $taxonomies as $_tax ) {
+ $hierarchy = _get_term_hierarchy( $_tax );
+
+ if ( isset( $hierarchy[ $_parent ] ) ) {
+ $in_hierarchy = true;
+ }
+ }
+
+ if ( ! $in_hierarchy ) {
+ return array();
+ }
+ }
+
+ $orderby = $this->parse_orderby( $this->query_vars['orderby'] );
+ if ( $orderby ) {
+ $orderby = "ORDER BY $orderby";
+ }
+
+ $order = $this->parse_order( $this->query_vars['order'] );
+
+ if ( $taxonomies ) {
+ $this->sql_clauses['where']['taxonomy'] = "tt.taxonomy IN ('" . implode( "', '", array_map( 'esc_sql', $taxonomies ) ) . "')";
+ }
+
+ $exclude = $args['exclude'];
+ $exclude_tree = $args['exclude_tree'];
+ $include = $args['include'];
+
+ $inclusions = '';
+ if ( ! empty( $include ) ) {
+ $exclude = '';
+ $exclude_tree = '';
+ $inclusions = implode( ',', wp_parse_id_list( $include ) );
+ }
+
+ if ( ! empty( $inclusions ) ) {
+ $this->sql_clauses['where']['inclusions'] = 't.term_id IN ( ' . $inclusions . ' )';
+ }
+
+ $exclusions = array();
+ if ( ! empty( $exclude_tree ) ) {
+ $exclude_tree = wp_parse_id_list( $exclude_tree );
+ $excluded_children = $exclude_tree;
+ foreach ( $exclude_tree as $extrunk ) {
+ $excluded_children = array_merge(
+ $excluded_children,
+ (array) get_terms( $taxonomies[0], array(
+ 'child_of' => intval( $extrunk ),
+ 'fields' => 'ids',
+ 'hide_empty' => 0
+ ) )
+ );
+ }
+ $exclusions = array_merge( $excluded_children, $exclusions );
+ }
+
+ if ( ! empty( $exclude ) ) {
+ $exclusions = array_merge( wp_parse_id_list( $exclude ), $exclusions );
+ }
+
+ // 'childless' terms are those without an entry in the flattened term hierarchy.
+ $childless = (bool) $args['childless'];
+ if ( $childless ) {
+ foreach ( $taxonomies as $_tax ) {
+ $term_hierarchy = _get_term_hierarchy( $_tax );
+ $exclusions = array_merge( array_keys( $term_hierarchy ), $exclusions );
+ }
+ }
+
+ if ( ! empty( $exclusions ) ) {
+ $exclusions = 't.term_id NOT IN (' . implode( ',', array_map( 'intval', $exclusions ) ) . ')';
+ } else {
+ $exclusions = '';
+ }
+
+ /**
+ * Filters the terms to exclude from the terms query.
+ *
+ * @since 2.3.0
+ *
+ * @param string $exclusions `NOT IN` clause of the terms query.
+ * @param array $args An array of terms query arguments.
+ * @param array $taxonomies An array of taxonomies.
+ */
+ $exclusions = apply_filters( 'list_terms_exclusions', $exclusions, $args, $taxonomies );
+
+ if ( ! empty( $exclusions ) ) {
+ // Must do string manipulation here for backward compatibility with filter.
+ $this->sql_clauses['where']['exclusions'] = preg_replace( '/^\s*AND\s*/', '', $exclusions );
+ }
+
+ if ( ! empty( $args['name'] ) ) {
+ $names = (array) $args['name'];
+ foreach ( $names as &$_name ) {
+ // `sanitize_term_field()` returns slashed data.
+ $_name = stripslashes( sanitize_term_field( 'name', $_name, 0, reset( $taxonomies ), 'db' ) );
+ }
+
+ $this->sql_clauses['where']['name'] = "t.name IN ('" . implode( "', '", array_map( 'esc_sql', $names ) ) . "')";
+ }
+
+ if ( ! empty( $args['slug'] ) ) {
+ if ( is_array( $args['slug'] ) ) {
+ $slug = array_map( 'sanitize_title', $args['slug'] );
+ $this->sql_clauses['where']['slug'] = "t.slug IN ('" . implode( "', '", $slug ) . "')";
+ } else {
+ $slug = sanitize_title( $args['slug'] );
+ $this->sql_clauses['where']['slug'] = "t.slug = '$slug'";
+ }
+ }
+
+ if ( ! empty( $args['term_taxonomy_id'] ) ) {
+ if ( is_array( $args['term_taxonomy_id'] ) ) {
+ $tt_ids = implode( ',', array_map( 'intval', $args['term_taxonomy_id'] ) );
+ $this->sql_clauses['where']['term_taxonomy_id'] = "tt.term_taxonomy_id IN ({$tt_ids})";
+ } else {
+ $this->sql_clauses['where']['term_taxonomy_id'] = $wpdb->prepare( "tt.term_taxonomy_id = %d", $args['term_taxonomy_id'] );
+ }
+ }
+
+ if ( ! empty( $args['name__like'] ) ) {
+ $this->sql_clauses['where']['name__like'] = $wpdb->prepare( "t.name LIKE %s", '%' . $wpdb->esc_like( $args['name__like'] ) . '%' );
+ }
+
+ if ( ! empty( $args['description__like'] ) ) {
+ $this->sql_clauses['where']['description__like'] = $wpdb->prepare( "tt.description LIKE %s", '%' . $wpdb->esc_like( $args['description__like'] ) . '%' );
+ }
+
+ if ( '' !== $parent ) {
+ $parent = (int) $parent;
+ $this->sql_clauses['where']['parent'] = "tt.parent = '$parent'";
+ }
+
+ $hierarchical = $args['hierarchical'];
+ if ( 'count' == $args['fields'] ) {
+ $hierarchical = false;
+ }
+ if ( $args['hide_empty'] && !$hierarchical ) {
+ $this->sql_clauses['where']['count'] = 'tt.count > 0';
+ }
+
+ $number = $args['number'];
+ $offset = $args['offset'];
+
+ // Don't limit the query results when we have to descend the family tree.
+ if ( $number && ! $hierarchical && ! $child_of && '' === $parent ) {
+ if ( $offset ) {
+ $limits = 'LIMIT ' . $offset . ',' . $number;
+ } else {
+ $limits = 'LIMIT ' . $number;
+ }
+ } else {
+ $limits = '';
+ }
+
+
+ if ( ! empty( $args['search'] ) ) {
+ $this->sql_clauses['where']['search'] = $this->get_search_sql( $args['search'] );
+ }
+
+ // Meta query support.
+ $join = '';
+ $distinct = '';
+
+ // Reparse meta_query query_vars, in case they were modified in a 'pre_get_terms' callback.
+ $this->meta_query->parse_query_vars( $this->query_vars );
+ $mq_sql = $this->meta_query->get_sql( 'term', 't', 'term_id' );
+ $meta_clauses = $this->meta_query->get_clauses();
+
+ if ( ! empty( $meta_clauses ) ) {
+ $join .= $mq_sql['join'];
+ $this->sql_clauses['where']['meta_query'] = preg_replace( '/^\s*AND\s*/', '', $mq_sql['where'] );
+ $distinct .= "DISTINCT";
+
+ }
+
+ $selects = array();
+ switch ( $args['fields'] ) {
+ case 'all':
+ $selects = array( 't.*', 'tt.*' );
+ break;
+ case 'ids':
+ case 'id=>parent':
+ $selects = array( 't.term_id', 'tt.parent', 'tt.count', 'tt.taxonomy' );
+ break;
+ case 'names':
+ $selects = array( 't.term_id', 'tt.parent', 'tt.count', 't.name', 'tt.taxonomy' );
+ break;
+ case 'count':
+ $orderby = '';
+ $order = '';
+ $selects = array( 'COUNT(*)' );
+ break;
+ case 'id=>name':
+ $selects = array( 't.term_id', 't.name', 'tt.count', 'tt.taxonomy' );
+ break;
+ case 'id=>slug':
+ $selects = array( 't.term_id', 't.slug', 'tt.count', 'tt.taxonomy' );
+ break;
+ }
+
+ $_fields = $args['fields'];
+
+ /**
+ * Filters the fields to select in the terms query.
+ *
+ * Field lists modified using this filter will only modify the term fields returned
+ * by the function when the `$fields` parameter set to 'count' or 'all'. In all other
+ * cases, the term fields in the results array will be determined by the `$fields`
+ * parameter alone.
+ *
+ * Use of this filter can result in unpredictable behavior, and is not recommended.
+ *
+ * @since 2.8.0
+ *
+ * @param array $selects An array of fields to select for the terms query.
+ * @param array $args An array of term query arguments.
+ * @param array $taxonomies An array of taxonomies.
+ */
+ $fields = implode( ', ', apply_filters( 'get_terms_fields', $selects, $args, $taxonomies ) );
+
+ $join .= " INNER JOIN $wpdb->term_taxonomy AS tt ON t.term_id = tt.term_id";
+
+ $where = implode( ' AND ', $this->sql_clauses['where'] );
+
+ $pieces = array( 'fields', 'join', 'where', 'distinct', 'orderby', 'order', 'limits' );
+
+ /**
+ * Filters the terms query SQL clauses.
+ *
+ * @since 3.1.0
+ *
+ * @param array $pieces Terms query SQL clauses.
+ * @param array $taxonomies An array of taxonomies.
+ * @param array $args An array of terms query arguments.
+ */
+ $clauses = apply_filters( 'terms_clauses', compact( $pieces ), $taxonomies, $args );
+
+ $fields = isset( $clauses[ 'fields' ] ) ? $clauses[ 'fields' ] : '';
+ $join = isset( $clauses[ 'join' ] ) ? $clauses[ 'join' ] : '';
+ $where = isset( $clauses[ 'where' ] ) ? $clauses[ 'where' ] : '';
+ $distinct = isset( $clauses[ 'distinct' ] ) ? $clauses[ 'distinct' ] : '';
+ $orderby = isset( $clauses[ 'orderby' ] ) ? $clauses[ 'orderby' ] : '';
+ $order = isset( $clauses[ 'order' ] ) ? $clauses[ 'order' ] : '';
+ $limits = isset( $clauses[ 'limits' ] ) ? $clauses[ 'limits' ] : '';
+
+ if ( $where ) {
+ $where = "WHERE $where";
+ }
+
+ $this->sql_clauses['select'] = "SELECT $distinct $fields";
+ $this->sql_clauses['from'] = "FROM $wpdb->terms AS t $join";
+ $this->sql_clauses['orderby'] = $orderby ? "$orderby $order" : '';
+ $this->sql_clauses['limits'] = $limits;
+
+ $this->request = "{$this->sql_clauses['select']} {$this->sql_clauses['from']} {$where} {$this->sql_clauses['orderby']} {$this->sql_clauses['limits']}";
+
+ // $args can be anything. Only use the args defined in defaults to compute the key.
+ $key = md5( serialize( wp_array_slice_assoc( $args, array_keys( $this->query_var_defaults ) ) ) . serialize( $taxonomies ) . $this->request );
+ $last_changed = wp_cache_get( 'last_changed', 'terms' );
+ if ( ! $last_changed ) {
+ $last_changed = microtime();
+ wp_cache_set( 'last_changed', $last_changed, 'terms' );
+ }
+ $cache_key = "get_terms:$key:$last_changed";
+ $cache = wp_cache_get( $cache_key, 'terms' );
+ if ( false !== $cache ) {
+ if ( 'all' === $_fields ) {
+ $cache = array_map( 'get_term', $cache );
+ }
+
+ $this->terms = $cache;
+ return $this->terms;
+ }
+
+ if ( 'count' == $_fields ) {
+ return $wpdb->get_var( $this->request );
+ }
+
+ $terms = $wpdb->get_results( $this->request );
+ if ( 'all' == $_fields ) {
+ update_term_cache( $terms );
+ }
+
+ // Prime termmeta cache.
+ if ( $args['update_term_meta_cache'] ) {
+ $term_ids = wp_list_pluck( $terms, 'term_id' );
+ update_termmeta_cache( $term_ids );
+ }
+
+ if ( empty( $terms ) ) {
+ wp_cache_add( $cache_key, array(), 'terms', DAY_IN_SECONDS );
+ return array();
+ }
+
+ if ( $child_of ) {
+ foreach ( $taxonomies as $_tax ) {
+ $children = _get_term_hierarchy( $_tax );
+ if ( ! empty( $children ) ) {
+ $terms = _get_term_children( $child_of, $terms, $_tax );
+ }
+ }
+ }
+
+ // Update term counts to include children.
+ if ( $args['pad_counts'] && 'all' == $_fields ) {
+ foreach ( $taxonomies as $_tax ) {
+ _pad_term_counts( $terms, $_tax );
+ }
+ }
+
+ // Make sure we show empty categories that have children.
+ if ( $hierarchical && $args['hide_empty'] && is_array( $terms ) ) {
+ foreach ( $terms as $k => $term ) {
+ if ( ! $term->count ) {
+ $children = get_term_children( $term->term_id, $term->taxonomy );
+ if ( is_array( $children ) ) {
+ foreach ( $children as $child_id ) {
+ $child = get_term( $child_id, $term->taxonomy );
+ if ( $child->count ) {
+ continue 2;
+ }
+ }
+ }
+
+ // It really is empty.
+ unset( $terms[ $k ] );
+ }
+ }
+ }
+
+ $_terms = array();
+ if ( 'id=>parent' == $_fields ) {
+ foreach ( $terms as $term ) {
+ $_terms[ $term->term_id ] = $term->parent;
+ }
+ } elseif ( 'ids' == $_fields ) {
+ foreach ( $terms as $term ) {
+ $_terms[] = $term->term_id;
+ }
+ } elseif ( 'names' == $_fields ) {
+ foreach ( $terms as $term ) {
+ $_terms[] = $term->name;
+ }
+ } elseif ( 'id=>name' == $_fields ) {
+ foreach ( $terms as $term ) {
+ $_terms[ $term->term_id ] = $term->name;
+ }
+ } elseif ( 'id=>slug' == $_fields ) {
+ foreach ( $terms as $term ) {
+ $_terms[ $term->term_id ] = $term->slug;
+ }
+ }
+
+ if ( ! empty( $_terms ) ) {
+ $terms = $_terms;
+ }
+
+ // Hierarchical queries are not limited, so 'offset' and 'number' must be handled now.
+ if ( $hierarchical && $number && is_array( $terms ) ) {
+ if ( $offset >= count( $terms ) ) {
+ $terms = array();
+ } else {
+ $terms = array_slice( $terms, $offset, $number, true );
+ }
+ }
+
+ wp_cache_add( $cache_key, $terms, 'terms', DAY_IN_SECONDS );
+
+ if ( 'all' === $_fields ) {
+ $terms = array_map( 'get_term', $terms );
+ }
+
+ $this->terms = $terms;
+ return $this->terms;
+ }
+
+ /**
+ * Parse and sanitize 'orderby' keys passed to the term query.
+ *
+ * @since 4.6.0
+ * @access protected
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param string $orderby_raw Alias for the field to order by.
+ * @return string|false Value to used in the ORDER clause. False otherwise.
+ */
+ protected function parse_orderby( $orderby_raw ) {
+ $_orderby = strtolower( $orderby_raw );
+ $maybe_orderby_meta = false;
+ if ( 'count' == $_orderby ) {
+ $orderby = 'tt.count';
+ } elseif ( 'name' == $_orderby ) {
+ $orderby = 't.name';
+ } elseif ( 'slug' == $_orderby ) {
+ $orderby = 't.slug';
+ } elseif ( 'include' == $_orderby && ! empty( $this->query_vars['include'] ) ) {
+ $include = implode( ',', array_map( 'absint', $this->query_vars['include'] ) );
+ $orderby = "FIELD( t.term_id, $include )";
+ } elseif ( 'term_group' == $_orderby ) {
+ $orderby = 't.term_group';
+ } elseif ( 'description' == $_orderby ) {
+ $orderby = 'tt.description';
+ } elseif ( 'none' == $_orderby ) {
+ $orderby = '';
+ } elseif ( empty( $_orderby ) || 'id' == $_orderby || 'term_id' === $_orderby ) {
+ $orderby = 't.term_id';
+ } else {
+ $orderby = 't.name';
+
+ // This may be a value of orderby related to meta.
+ $maybe_orderby_meta = true;
+ }
+
+ /**
+ * Filters the ORDERBY clause of the terms query.
+ *
+ * @since 2.8.0
+ *
+ * @param string $orderby `ORDERBY` clause of the terms query.
+ * @param array $args An array of terms query arguments.
+ * @param array $taxonomies An array of taxonomies.
+ */
+ $orderby = apply_filters( 'get_terms_orderby', $orderby, $this->query_vars, $this->query_vars['taxonomy'] );
+
+ // Run after the 'get_terms_orderby' filter for backward compatibility.
+ if ( $maybe_orderby_meta ) {
+ $maybe_orderby_meta = $this->parse_orderby_meta( $_orderby );
+ if ( $maybe_orderby_meta ) {
+ $orderby = $maybe_orderby_meta;
+ }
+ }
+
+ return $orderby;
+ }
+
+ /**
+ * Generate the ORDER BY clause for an 'orderby' param that is potentially related to a meta query.
+ *
+ * @since 4.6.0
+ * @access public
+ *
+ * @param string $orderby_raw Raw 'orderby' value passed to WP_Term_Query.
+ * @return string
+ */
+ protected function parse_orderby_meta( $orderby_raw ) {
+ $orderby = '';
+
+ // Tell the meta query to generate its SQL, so we have access to table aliases.
+ $this->meta_query->get_sql( 'term', 't', 'term_id' );
+ $meta_clauses = $this->meta_query->get_clauses();
+ if ( ! $meta_clauses || ! $orderby_raw ) {
+ return $orderby;
+ }
+
+ $allowed_keys = array();
+ $primary_meta_key = null;
+ $primary_meta_query = reset( $meta_clauses );
+ if ( ! empty( $primary_meta_query['key'] ) ) {
+ $primary_meta_key = $primary_meta_query['key'];
+ $allowed_keys[] = $primary_meta_key;
+ }
+ $allowed_keys[] = 'meta_value';
+ $allowed_keys[] = 'meta_value_num';
+ $allowed_keys = array_merge( $allowed_keys, array_keys( $meta_clauses ) );
+
+ if ( ! in_array( $orderby_raw, $allowed_keys, true ) ) {
+ return $orderby;
+ }
+
+ switch( $orderby_raw ) {
+ case $primary_meta_key:
+ case 'meta_value':
+ if ( ! empty( $primary_meta_query['type'] ) ) {
+ $orderby = "CAST({$primary_meta_query['alias']}.meta_value AS {$primary_meta_query['cast']})";
+ } else {
+ $orderby = "{$primary_meta_query['alias']}.meta_value";
+ }
+ break;
+
+ case 'meta_value_num':
+ $orderby = "{$primary_meta_query['alias']}.meta_value+0";
+ break;
+
+ default:
+ if ( array_key_exists( $orderby_raw, $meta_clauses ) ) {
+ // $orderby corresponds to a meta_query clause.
+ $meta_clause = $meta_clauses[ $orderby_raw ];
+ $orderby = "CAST({$meta_clause['alias']}.meta_value AS {$meta_clause['cast']})";
+ }
+ break;
+ }
+
+ return $orderby;
+ }
+
+ /**
+ * Parse an 'order' query variable and cast it to ASC or DESC as necessary.
+ *
+ * @since 4.6.0
+ * @access protected
+ *
+ * @param string $order The 'order' query variable.
+ * @return string The sanitized 'order' query variable.
+ */
+ protected function parse_order( $order ) {
+ if ( ! is_string( $order ) || empty( $order ) ) {
+ return 'DESC';
+ }
+
+ if ( 'ASC' === strtoupper( $order ) ) {
+ return 'ASC';
+ } else {
+ return 'DESC';
+ }
+ }
+
+ /**
+ * Used internally to generate a SQL string related to the 'search' parameter.
+ *
+ * @since 4.6.0
+ * @access protected
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param string $string
+ * @return string
+ */
+ protected function get_search_sql( $string ) {
+ global $wpdb;
+
+ $like = '%' . $wpdb->esc_like( $string ) . '%';
+
+ return $wpdb->prepare( '((t.name LIKE %s) OR (t.slug LIKE %s))', $like, $like );
+ }
+}
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