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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 |
|---|---|
| 1757 | /** |
| 1758 | * Filter the given taxonomy's terms cache. |
| 1759 | * |
| 1760 | * @since 2.3.0 |
| 1761 | * |
| 1762 | * @param array $cache Cached array of terms for the given taxonomy. |
| 1763 | * @param array $taxonomies An array of taxonomies. |
| 1764 | * @param array $args An array of get_terms() arguments. |
| 1765 | */ |
| 1766 | return apply_filters( 'get_terms', $cache, $taxonomies, $args ); |
| 1767 | } |
| 1768 | |
| 1769 | $_orderby = strtolower( $args['orderby'] ); |
| 1770 | if ( 'count' == $_orderby ) { |
| 1771 | $orderby = 'tt.count'; |
| 1772 | } elseif ( 'name' == $_orderby ) { |
| 1773 | $orderby = 't.name'; |
| 1774 | } elseif ( 'slug' == $_orderby ) { |
| 1775 | $orderby = 't.slug'; |
| Line | Code |
| 2010 | $terms = $wpdb->get_results($query); |
| 2011 | if ( 'all' == $_fields ) { |
| 2012 | update_term_cache( $terms ); |
| 2013 | } |
| 2014 | |
| 2015 | if ( empty($terms) ) { |
| 2016 | wp_cache_add( $cache_key, array(), 'terms', DAY_IN_SECONDS ); |
| 2017 | |
| 2018 | /** This filter is documented in wp-includes/taxonomy.php */ |
| 2019 | return apply_filters( 'get_terms', array(), $taxonomies, $args ); |
| 2020 | } |
| 2021 | |
| 2022 | if ( $child_of ) { |
| 2023 | foreach ( $taxonomies as $_tax ) { |
| 2024 | $children = _get_term_hierarchy( $_tax ); |
| 2025 | if ( ! empty( $children ) ) { |
| 2026 | $terms = _get_term_children( $child_of, $terms, $_tax ); |
| 2027 | } |
| 2028 | } |
| Line | Code |
| 2083 | } |
| 2084 | |
| 2085 | if ( $number && is_array( $terms ) && count( $terms ) > $number ) { |
| 2086 | $terms = array_slice( $terms, $offset, $number ); |
| 2087 | } |
| 2088 | |
| 2089 | wp_cache_add( $cache_key, $terms, 'terms', DAY_IN_SECONDS ); |
| 2090 | |
| 2091 | /** This filter is documented in wp-includes/taxonomy */ |
| 2092 | return apply_filters( 'get_terms', $terms, $taxonomies, $args ); |
| 2093 | } |
| 2094 | |
| 2095 | /** |
| 2096 | * Check if Term exists. |
| 2097 | * |
| 2098 | * Formerly is_term(), introduced in 2.3.0. |
| 2099 | * |
| 2100 | * @since 3.0.0 |
| 2101 | * |