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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 |
|---|---|
| 1209 | $key = md5( serialize( compact(array_keys($defaults)) ) . serialize( $taxonomies ) . $filter_key ); |
| 1210 | $last_changed = wp_cache_get('last_changed', 'terms'); |
| 1211 | if ( !$last_changed ) { |
| 1212 | $last_changed = time(); |
| 1213 | wp_cache_set('last_changed', $last_changed, 'terms'); |
| 1214 | } |
| 1215 | $cache_key = "get_terms:$key:$last_changed"; |
| 1216 | $cache = wp_cache_get( $cache_key, 'terms' ); |
| 1217 | if ( false !== $cache ) { |
| 1218 | $cache = apply_filters('get_terms', $cache, $taxonomies, $args); |
| 1219 | return $cache; |
| 1220 | } |
| 1221 | |
| 1222 | $_orderby = strtolower($orderby); |
| 1223 | if ( 'count' == $_orderby ) |
| 1224 | $orderby = 'tt.count'; |
| 1225 | else if ( 'name' == $_orderby ) |
| 1226 | $orderby = 't.name'; |
| 1227 | else if ( 'slug' == $_orderby ) |
| Line | Code |
| 1366 | } |
| 1367 | |
| 1368 | $terms = $wpdb->get_results($query); |
| 1369 | if ( 'all' == $fields ) { |
| 1370 | update_term_cache($terms); |
| 1371 | } |
| 1372 | |
| 1373 | if ( empty($terms) ) { |
| 1374 | wp_cache_add( $cache_key, array(), 'terms', 86400 ); // one day |
| 1375 | $terms = apply_filters('get_terms', array(), $taxonomies, $args); |
| 1376 | return $terms; |
| 1377 | } |
| 1378 | |
| 1379 | if ( $child_of ) { |
| 1380 | $children = _get_term_hierarchy($taxonomies[0]); |
| 1381 | if ( ! empty($children) ) |
| 1382 | $terms = & _get_term_children($child_of, $terms, $taxonomies[0]); |
| 1383 | } |
| 1384 | |
| Line | Code |
| 1418 | $terms = $_terms; |
| 1419 | } |
| 1420 | |
| 1421 | if ( 0 < $number && intval(@count($terms)) > $number ) { |
| 1422 | $terms = array_slice($terms, $offset, $number); |
| 1423 | } |
| 1424 | |
| 1425 | wp_cache_add( $cache_key, $terms, 'terms', 86400 ); // one day |
| 1426 | |
| 1427 | $terms = apply_filters('get_terms', $terms, $taxonomies, $args); |
| 1428 | return $terms; |
| 1429 | } |
| 1430 | |
| 1431 | /** |
| 1432 | * Check if Term exists. |
| 1433 | * |
| 1434 | * Returns the index of a defined term, or 0 (false) if the term doesn't exist. |
| 1435 | * |
| 1436 | * Formerly is_term(), introduced in 2.3.0. |