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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 |
|---|---|
| 577 | if ( $parent ) { |
| 578 | $hierarchy = _get_term_hierarchy($taxonomies[0]); |
| 579 | if ( !isset($hierarchy[$parent]) ) |
| 580 | return $empty_array; |
| 581 | } |
| 582 | |
| 583 | $key = md5( serialize( $args ) . serialize( $taxonomies ) ); |
| 584 | if ( $cache = wp_cache_get( 'get_terms', 'terms' ) ) { |
| 585 | if ( isset( $cache[ $key ] ) ) |
| 586 | return apply_filters('get_terms', $cache[$key], $taxonomies, $args); |
| 587 | } |
| 588 | |
| 589 | if ( 'count' == $orderby ) |
| 590 | $orderby = 'tt.count'; |
| 591 | else if ( 'name' == $orderby ) |
| 592 | $orderby = 't.name'; |
| 593 | else if ( 'slug' == $orderby ) |
| 594 | $orderby = 't.slug'; |
| 595 | else if ( 'term_group' == $orderby ) |
| Line | Code |
| 678 | $terms = $wpdb->get_results($query); |
| 679 | update_term_cache($terms); |
| 680 | } else if ( ('ids' == $fields) || ('names' == $fields) ) { |
| 681 | $terms = $wpdb->get_col($query); |
| 682 | } |
| 683 | |
| 684 | if ( empty($terms) ) { |
| 685 | $cache[ $key ] = array(); |
| 686 | wp_cache_set( 'get_terms', $cache, 'terms' ); |
| 687 | return apply_filters('get_terms', array(), $taxonomies, $args); |
| 688 | } |
| 689 | |
| 690 | if ( $child_of || $hierarchical ) { |
| 691 | $children = _get_term_hierarchy($taxonomies[0]); |
| 692 | if ( ! empty($children) ) |
| 693 | $terms = & _get_term_children($child_of, $terms, $taxonomies[0]); |
| 694 | } |
| 695 | |
| 696 | // Update term counts to include children. |
| Line | Code |
| 710 | unset($terms[$k]); |
| 711 | } |
| 712 | } |
| 713 | } |
| 714 | reset ( $terms ); |
| 715 | |
| 716 | $cache[ $key ] = $terms; |
| 717 | wp_cache_set( 'get_terms', $cache, 'terms' ); |
| 718 | |
| 719 | $terms = apply_filters('get_terms', $terms, $taxonomies, $args); |
| 720 | return $terms; |
| 721 | } |
| 722 | |
| 723 | /** |
| 724 | * is_term() - Check if Term exists |
| 725 | * |
| 726 | * Returns the index of a defined term, or 0 (false) if the term doesn't exist. |
| 727 | * |
| 728 | * @package WordPress |