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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.
| Line | Code |
|---|---|
| 772 | } |
| 773 | |
| 774 | $selects = array(); |
| 775 | if ( 'all' == $fields ) |
| 776 | $selects = array('t.*', 'tt.*'); |
| 777 | else if ( 'ids' == $fields ) |
| 778 | $selects = array('t.term_id', 'tt.parent', 'tt.count'); |
| 779 | else if ( 'names' == $fields ) |
| 780 | $selects = array('t.term_id', 'tt.parent', 'tt.count', 't.name'); |
| 781 | $select_this = implode(', ', apply_filters( 'get_terms_fields', $selects, $args )); |
| 782 | |
| 783 | $query = "SELECT $select_this FROM $wpdb->terms AS t INNER JOIN $wpdb->term_taxonomy AS tt ON t.term_id = tt.term_id WHERE tt.taxonomy IN ($in_taxonomies) $where ORDER BY $orderby $order $limit"; |
| 784 | |
| 785 | $terms = $wpdb->get_results($query); |
| 786 | if ( 'all' == $fields ) { |
| 787 | update_term_cache($terms); |
| 788 | } |
| 789 | |
| 790 | if ( empty($terms) ) { |