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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
This hook occurs 3 times in this file.
| Line | Code |
|---|---|
| 869 | $key = md5( serialize( compact(array_keys($defaults)) ) . serialize( $taxonomies ) . $filter_key ); |
| 870 | $last_changed = wp_cache_get('last_changed', 'terms'); |
| 871 | if ( !$last_changed ) { |
| 872 | $last_changed = time(); |
| 873 | wp_cache_set('last_changed', $last_changed, 'terms'); |
| 874 | } |
| 875 | $cache_key = "get_terms:$key:$last_changed"; |
| 876 | $cache = wp_cache_get( $cache_key, 'terms' ); |
| 877 | if ( false !== $cache ) { |
| 878 | $cache = apply_filters('get_terms', $cache, $taxonomies, $args); |
| 879 | return $cache; |
| 880 | } |
| 881 | |
| 882 | $_orderby = strtolower($orderby); |
| 883 | if ( 'count' == $_orderby ) |
| 884 | $orderby = 'tt.count'; |
| 885 | else if ( 'name' == $_orderby ) |
| 886 | $orderby = 't.name'; |
| 887 | else if ( 'slug' == $_orderby ) |
| Line | Code |
| 1006 | } |
| 1007 | |
| 1008 | $terms = $wpdb->get_results($query); |
| 1009 | if ( 'all' == $fields ) { |
| 1010 | update_term_cache($terms); |
| 1011 | } |
| 1012 | |
| 1013 | if ( empty($terms) ) { |
| 1014 | wp_cache_add( $cache_key, array(), 'terms' ); |
| 1015 | $terms = apply_filters('get_terms', array(), $taxonomies, $args); |
| 1016 | return $terms; |
| 1017 | } |
| 1018 | |
| 1019 | if ( $child_of ) { |
| 1020 | $children = _get_term_hierarchy($taxonomies[0]); |
| 1021 | if ( ! empty($children) ) |
| 1022 | $terms = & _get_term_children($child_of, $terms, $taxonomies[0]); |
| 1023 | } |
| 1024 | |
| Line | Code |
| 1058 | $terms = $_terms; |
| 1059 | } |
| 1060 | |
| 1061 | if ( 0 < $number && intval(@count($terms)) > $number ) { |
| 1062 | $terms = array_slice($terms, $offset, $number); |
| 1063 | } |
| 1064 | |
| 1065 | wp_cache_add( $cache_key, $terms, 'terms' ); |
| 1066 | |
| 1067 | $terms = apply_filters('get_terms', $terms, $taxonomies, $args); |
| 1068 | return $terms; |
| 1069 | } |
| 1070 | |
| 1071 | /** |
| 1072 | * Check if Term exists. |
| 1073 | * |
| 1074 | * Returns the index of a defined term, or 0 (false) if the term doesn't exist. |
| 1075 | * |
| 1076 | * Formerly is_term(), introduced in 2.3.0. |