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<?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
	 * @var string
	 */
	public $request;

/**
	 * Metadata query container.
	 *
	 * @since 4.6.0
	 * @var object WP_Meta_Query
	 */
	public $meta_query = false;

/**
	 * Metadata query clauses.
	 *
	 * @since 4.6.0
	 * @var array
	 */
	protected $meta_query_clauses;

/**
	 * SQL query clauses.
	 *
	 * @since 4.6.0
	 * @var array
	 */
	protected $sql_clauses = array(
		'select'  => '',
		'from'    => '',
		'where'   => array(),
		'orderby' => '',
		'limits'  => '',
	);

/**
	 * Query vars set by the user.
	 *
	 * @since 4.6.0
	 * @var array
	 */
	public $query_vars;

/**
	 * Default values for query vars.
	 *
	 * @since 4.6.0
	 * @var array
	 */
	public $query_var_defaults;

/**
	 * List of terms located by the query.
	 *
	 * @since 4.6.0
	 * @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.
	 * @since 4.7.0 Introduced 'object_ids' parameter.
	 * @since 4.9.0 Added 'slug__in' support for 'orderby'.
	 *
	 * @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 int|array    $object_ids             Optional. Object ID, or array of object IDs. Results will be
	 *                                                limited to terms associated with these objects.
	 *     @type string       $orderby                Field(s) to order terms by. Accepts term fields ('name',
	 *                                                'slug', 'term_group', 'term_id', 'id', 'description', 'parent'),
	 *                                                'count' for term taxonomy count, 'include' to match the
	 *                                                'order' of the $include param, 'slug__in' to match the
	 *                                                'order' of the $slug param, 'meta_value', 'meta_value_num',
	 *                                                the value of `$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). Note that $number may
	 *                                                not return accurate results when coupled with $object_ids.
	 *                                                See #41796 for details.
	 *     @type int          $offset                 The number by which to offset the terms query. Default empty.
	 *     @type string       $fields                 Term fields to query for. Accepts 'all' (returns an array of
	 *                                                complete term objects), 'all_with_object_id' (returns an
	 *                                                array of term objects with the 'object_id' param; works only
	 *                                                when the `$object_ids` parameter is populated), 'ids'
	 *                                                (returns an array of ids), 'tt_ids' (returns an array of
	 *                                                term taxonomy 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`. Default empty.
	 *     @type string       $meta_value             Limit terms to those matching a specific metadata value.
	 *                                                Usually used in conjunction with `$meta_key`. Default empty.
	 *     @type string       $meta_type              MySQL data type that the `$meta_value` will be CAST to for
	 *                                                comparisons. Default empty.
	 *     @type string       $meta_compare           Comparison operator to test the 'meta_value'. Default empty.
	 * }
	 */
	public function __construct( $query = '' ) {
		$this->query_var_defaults = array(
			'taxonomy'               => null,
			'object_ids'             => 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'             => '',
			'meta_key'               => '',
			'meta_value'             => '',
			'meta_type'              => '',
			'meta_compare'           => '',
		);

if ( ! empty( $query ) ) {
			$this->query( $query );
		}
	}

/**
	 * Parse arguments passed to the term query with default query parameters.
	 *
	 * @since 4.6.0
	 *
	 * @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 string[] $taxonomies An array of taxonomy names.
		 */
		$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;

$this->query_vars = $query;

/**
		 * 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
	 *
	 * @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.
	 *
	 * @since 4.6.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 *
	 * @return array List of terms.
	 */
	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 = (array) $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'

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