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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 |
|---|---|
| 1452 | $selects = array( 't.term_id', 't.name' ); |
| 1453 | break; |
| 1454 | case 'id=>slug': |
| 1455 | $selects = array( 't.term_id', 't.slug' ); |
| 1456 | break; |
| 1457 | } |
| 1458 | |
| 1459 | $_fields = $fields; |
| 1460 | |
| 1461 | $fields = implode( ', ', apply_filters( 'get_terms_fields', $selects, $args, $taxonomies ) ); |
| 1462 | |
| 1463 | $join = "INNER JOIN $wpdb->term_taxonomy AS tt ON t.term_id = tt.term_id"; |
| 1464 | |
| 1465 | $pieces = array( 'fields', 'join', 'where', 'orderby', 'order', 'limits' ); |
| 1466 | $clauses = apply_filters( 'terms_clauses', compact( $pieces ), $taxonomies, $args ); |
| 1467 | foreach ( $pieces as $piece ) |
| 1468 | $$piece = isset( $clauses[ $piece ] ) ? $clauses[ $piece ] : ''; |
| 1469 | |
| 1470 | $query = "SELECT $fields FROM $wpdb->terms AS t $join WHERE $where $orderby $order $limits"; |