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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 2 times in this file.
| Line | Code |
|---|---|
| 491 | if ( $parent ) { |
| 492 | $hierarchy = _get_term_hierarchy($taxonomies[0]); |
| 493 | if ( !isset($hierarchy[$parent]) ) |
| 494 | return array(); |
| 495 | } |
| 496 | |
| 497 | $key = md5( serialize( $args ) . serialize( $taxonomies ) ); |
| 498 | if ( $cache = wp_cache_get( 'get_terms', 'terms' ) ) { |
| 499 | if ( isset( $cache[ $key ] ) ) |
| 500 | return apply_filters('get_terms', $cache[$key], $taxonomies, $args); |
| 501 | } |
| 502 | |
| 503 | if ( 'count' == $orderby ) |
| 504 | $orderby = 'tt.count'; |
| 505 | else if ( 'name' == $orderby ) |
| 506 | $orderby = 't.name'; |
| 507 | else |
| 508 | $orderby = 't.term_id'; |
| 509 | |
| Line | Code |
| 607 | unset($terms[$k]); |
| 608 | } |
| 609 | } |
| 610 | } |
| 611 | reset ( $terms ); |
| 612 | |
| 613 | $cache[ $key ] = $terms; |
| 614 | wp_cache_set( 'get_terms', $cache, 'terms' ); |
| 615 | |
| 616 | $terms = apply_filters('get_terms', $terms, $taxonomies, $args); |
| 617 | return $terms; |
| 618 | } |
| 619 | |
| 620 | /** |
| 621 | * is_term() - Check if Term exists |
| 622 | * |
| 623 | * Returns the index of a defined term, or 0 (false) if the term doesn't exist. |
| 624 | * |
| 625 | * @global $wpdb Database Object |