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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'.
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 string[] $taxonomies An array of taxonomy names.
*/
$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 ) {
if ( 'count' == $args['fields'] ) {
return 0;
} else {
$this->terms = array();
return $this->terms;
}
}
}
// 'term_order' is a legal sort order only when joining the relationship table.
$_orderby = $this->query_vars['orderby'];
if ( 'term_order' === $_orderby && empty( $this->query_vars['object_ids'] ) ) {
$_orderby = 'term_id';
}
$orderby = $this->parse_orderby( $_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(
reset( $taxonomies ),
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 string[] $taxonomies An array of taxonomy names.
*/
$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'] ) ) ||
( is_string( $args['name'] ) && 0 !== strlen( $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'] ) ) ||
( is_string( $args['slug'] ) && 0 !== strlen( $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 ( ! empty( $args['object_ids'] ) ) {
$object_ids = $args['object_ids'];
if ( ! is_array( $object_ids ) ) {
$object_ids = array( $object_ids );
}
$object_ids = implode( ', ', array_map( 'intval', $object_ids ) );
$this->sql_clauses['where']['object_ids'] = "tr.object_id IN ($object_ids)";
}
/*
* When querying for object relationships, the 'count > 0' check
* added by 'hide_empty' is superfluous.
*/
if ( ! empty( $args['object_ids'] ) ) {
$args['hide_empty'] = false;
}
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':
case 'all_with_object_id':
case 'tt_ids':
case 'slugs':
$selects = array( 't.*', 'tt.*' );
if ( 'all_with_object_id' === $args['fields'] && ! empty( $args['object_ids'] ) ) {
$selects[] = 'tr.object_id';
}
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 string[] $selects An array of fields to select for the terms query.
* @param array $args An array of term query arguments.
* @param string[] $taxonomies An array of taxonomy names.
*/
$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";
if ( ! empty( $this->query_vars['object_ids'] ) ) {
$join .= " INNER JOIN {$wpdb->term_relationships} AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id";
}
$where = implode( ' AND ', $this->sql_clauses['where'] );
/**
* Filters the terms query SQL clauses.
*
* @since 3.1.0
*
* @param string[] $pieces Array of query SQL clauses.
* @param string[] $taxonomies An array of taxonomy names.
* @param array $args An array of term query arguments.
*/
$clauses = apply_filters( 'terms_clauses', compact( 'fields', 'join', 'where', 'distinct', 'orderby', 'order', 'limits' ), $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' );
$cache_key = "get_terms:$key:$last_changed";
$cache = wp_cache_get( $cache_key, 'terms' );
if ( false !== $cache ) {
if ( 'all' === $_fields || 'all_with_object_id' === $_fields ) {
$cache = $this->populate_terms( $cache );
}
$this->terms = $cache;
return $this->terms;
}
if ( 'count' == $_fields ) {
$count = $wpdb->get_var( $this->request );
wp_cache_set( $cache_key, $count, 'terms' );
return $count;
}
$terms = $wpdb->get_results( $this->request );
if ( 'all' == $_fields || 'all_with_object_id' === $_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[ $k ] );
}
}
}
/*
* When querying for terms connected to objects, we may get
* duplicate results. The duplicates should be preserved if
* `$fields` is 'all_with_object_id', but should otherwise be
* removed.
*/
if ( ! empty( $args['object_ids'] ) && 'all_with_object_id' != $_fields ) {
$_tt_ids = $_terms = array();
foreach ( $terms as $term ) {
if ( isset( $_tt_ids[ $term->term_id ] ) ) {
continue;
}
$_tt_ids[ $term->term_id ] = 1;
$_terms[] = $term;
}
$terms = $_terms;
}
$_terms = array();
if ( 'id=>parent' == $_fields ) {
foreach ( $terms as $term ) {
$_terms[ $term->term_id ] = $term->parent;
}
} elseif ( 'ids' == $_fields ) {
foreach ( $terms as $term ) {
$_terms[] = (int) $term->term_id;
}
} elseif ( 'tt_ids' == $_fields ) {
foreach ( $terms as $term ) {
$_terms[] = (int) $term->term_taxonomy_id;
}
} elseif ( 'names' == $_fields ) {
foreach ( $terms as $term ) {
$_terms[] = $term->name;
}
} elseif ( 'slugs' == $_fields ) {
foreach ( $terms as $term ) {
$_terms[] = $term->slug;
}
} 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 || 'all_with_object_id' === $_fields ) {
$terms = $this->populate_terms( $terms );
}
$this->terms = $terms;
return $this->terms;
}
/**
* Parse and sanitize 'orderby' keys passed to the term query.
*
* @since 4.6.0
*
* @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 ( in_array( $_orderby, array( 'term_id', 'name', 'slug', 'term_group' ), true ) ) {
$orderby = "t.$_orderby";
} elseif ( in_array( $_orderby, array( 'count', 'parent', 'taxonomy', 'term_taxonomy_id', 'description' ), true ) ) {
$orderby = "tt.$_orderby";
} elseif ( 'term_order' === $_orderby ) {
$orderby = 'tr.term_order';
} elseif ( 'include' == $_orderby && ! empty( $this->query_vars['include'] ) ) {
$include = implode( ',', wp_parse_id_list( $this->query_vars['include'] ) );
$orderby = "FIELD( t.term_id, $include )";
} elseif ( 'slug__in' == $_orderby && ! empty( $this->query_vars['slug'] ) && is_array( $this->query_vars['slug'] ) ) {
$slugs = implode( "', '", array_map( 'sanitize_title_for_query', $this->query_vars['slug'] ) );
$orderby = "FIELD( t.slug, '" . $slugs . "')";
} 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 term query arguments.
* @param string[] $taxonomies An array of taxonomy names.
*/
$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
*
* @param string $orderby_raw Raw 'orderby' value passed to WP_Term_Query.
* @return string ORDER BY clause.
*/
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
*
* @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
*
* @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 );
}
/**
* Creates an array of term objects from an array of term IDs.
*
* Also discards invalid term objects.
*
* @since 4.9.8
*
* @param array $term_ids Term IDs.
* @return array
*/
protected function populate_terms( $term_ids ) {
$terms = array();
if ( ! is_array( $term_ids ) ) {
return $terms;
}
foreach ( $term_ids as $key => $term_id ) {
$term = get_term( $term_id );
if ( $term instanceof WP_Term ) {
$terms[ $key ] = $term;
}
}
return $terms;
}
}