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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 |
|---|---|
| 1166 | $key = md5( serialize( compact(array_keys($defaults)) ) . serialize( $taxonomies ) . $filter_key ); |
| 1167 | $last_changed = wp_cache_get('last_changed', 'terms'); |
| 1168 | if ( !$last_changed ) { |
| 1169 | $last_changed = time(); |
| 1170 | wp_cache_set('last_changed', $last_changed, 'terms'); |
| 1171 | } |
| 1172 | $cache_key = "get_terms:$key:$last_changed"; |
| 1173 | $cache = wp_cache_get( $cache_key, 'terms' ); |
| 1174 | if ( false !== $cache ) { |
| 1175 | $cache = apply_filters('get_terms', $cache, $taxonomies, $args); |
| 1176 | return $cache; |
| 1177 | } |
| 1178 | |
| 1179 | $_orderby = strtolower($orderby); |
| 1180 | if ( 'count' == $_orderby ) |
| 1181 | $orderby = 'tt.count'; |
| 1182 | else if ( 'name' == $_orderby ) |
| 1183 | $orderby = 't.name'; |
| 1184 | else if ( 'slug' == $_orderby ) |
| Line | Code |
| 1315 | } |
| 1316 | |
| 1317 | $terms = $wpdb->get_results($query); |
| 1318 | if ( 'all' == $fields ) { |
| 1319 | update_term_cache($terms); |
| 1320 | } |
| 1321 | |
| 1322 | if ( empty($terms) ) { |
| 1323 | wp_cache_add( $cache_key, array(), 'terms', 86400 ); // one day |
| 1324 | $terms = apply_filters('get_terms', array(), $taxonomies, $args); |
| 1325 | return $terms; |
| 1326 | } |
| 1327 | |
| 1328 | if ( $child_of ) { |
| 1329 | $children = _get_term_hierarchy($taxonomies[0]); |
| 1330 | if ( ! empty($children) ) |
| 1331 | $terms = & _get_term_children($child_of, $terms, $taxonomies[0]); |
| 1332 | } |
| 1333 | |
| Line | Code |
| 1367 | $terms = $_terms; |
| 1368 | } |
| 1369 | |
| 1370 | if ( 0 < $number && intval(@count($terms)) > $number ) { |
| 1371 | $terms = array_slice($terms, $offset, $number); |
| 1372 | } |
| 1373 | |
| 1374 | wp_cache_add( $cache_key, $terms, 'terms', 86400 ); // one day |
| 1375 | |
| 1376 | $terms = apply_filters('get_terms', $terms, $taxonomies, $args); |
| 1377 | return $terms; |
| 1378 | } |
| 1379 | |
| 1380 | /** |
| 1381 | * Check if Term exists. |
| 1382 | * |
| 1383 | * Returns the index of a defined term, or 0 (false) if the term doesn't exist. |
| 1384 | * |
| 1385 | * Formerly is_term(), introduced in 2.3.0. |