WP_Term_Query::__construct

(Optional) Array or query string of term query parameters.

• 'taxonomy'
  (string|array) Taxonomy name, or array of taxonomies, to which results should be limited.
• 'object_ids'
  (int|array) Optional. Object ID, or array of object IDs. Results will be limited to terms associated with these objects.
• 'orderby'
  (string) 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'.
• 'order'
  (string) Whether to order terms in ascending or descending order. Accepts 'ASC' (ascending) or 'DESC' (descending). Default 'ASC'.
• 'hide_empty'
  (bool|int) Whether to hide terms not assigned to any posts. Accepts 1|true or 0|false. Default 1|true.
• 'include'
  (array|string) Array or comma/space-separated string of term ids to include. Default empty array.
• 'exclude'
  (array|string) Array or comma/space-separated string of term ids to exclude. If $include is non-empty, $exclude is ignored. Default empty array.
• 'exclude_tree'
  (array|string) 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.
• 'number'
  (int|string) 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.
• 'offset'
  (int) The number by which to offset the terms query.
• 'fields'
  (string) Term fields to query for. Accepts: - 'all' Returns an array of complete term objects (WP_Term[] ). - 'all_with_object_id' Returns an array of term objects with the 'object_id' param (WP_Term[]). Works only when the $object_ids parameter is populated. - 'ids' Returns an array of term IDs (int[]). - 'tt_ids' Returns an array of term taxonomy IDs (int[]). - 'names' Returns an array of term names (string[]). - 'slugs' Returns an array of term slugs (string[]). - 'count' Returns the number of matching terms (int). - 'id=>parent' Returns an associative array of parent term IDs, keyed by term ID (int[]). - 'id=>name' Returns an associative array of term names, keyed by term ID (string[]). - 'id=>slug' Returns an associative array of term slugs, keyed by term ID (string[]). Default 'all'.
• 'count'
  (bool) Whether to return a term count. Will take precedence over $fields if true. Default false.
• 'name'
  (string|array) Optional. Name or array of names to return term(s) for.
• 'slug'
  (string|array) Optional. Slug or array of slugs to return term(s) for.
• 'term_taxonomy_id'
  (int|array) Optional. Term taxonomy ID, or array of term taxonomy IDs, to match when querying terms.
• 'hierarchical'
  (bool) Whether to include terms that have non-empty descendants (even if $hide_empty is set to true). Default true.
• 'search'
  (string) Search criteria to match terms. Will be SQL-formatted with wildcards before and after.
• 'name__like'
  (string) Retrieve terms with criteria by which a term is LIKE $name__like.
• 'description__like'
  (string) Retrieve terms where the description is LIKE $description__like.
• 'pad_counts'
  (bool) Whether to pad the quantity of a term's children in the quantity of each term's "count" object variable. Default false.
• 'get'
  (string) Whether to return terms regardless of ancestry or whether the terms are empty. Accepts 'all' or empty (disabled).
• 'child_of'
  (int) Term ID to retrieve child terms of. If multiple taxonomies are passed, $child_of is ignored. Default 0.
• 'parent'
  (int|string) Parent term ID to retrieve direct-child terms of.
• 'childless'
  (bool) True to limit results to terms that have no children. This parameter has no effect on non-hierarchical taxonomies. Default false.
• 'cache_domain'
  (string) Unique cache key to be produced when this query is stored in an object cache. Default is 'core'.
• 'update_term_meta_cache'
  (bool) Whether to prime meta caches for matched terms. Default true.
• 'meta_query'
  (array) Optional. Meta query clauses to limit retrieved terms by. See WP_Meta_Query.
• 'meta_key'
  (string) Limit terms to those matching a specific metadata key. Can be used in conjunction with $meta_value.
• 'meta_value'
  (string) Limit terms to those matching a specific metadata value. Usually used in conjunction with $meta_key.
• 'meta_type'
  (string) MySQL data type that the $meta_value will be CAST to for comparisons.
• 'meta_compare'
  (string) Comparison operator to test the 'meta_value'.

Default value: ''