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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 |
|---|---|
| 2506 | * Fires immediately after an object-term relationship is added. |
| 2507 | * |
| 2508 | * @since 2.9.0 |
| 2509 | * @since 4.7.0 Added the `$taxonomy` parameter. |
| 2510 | * |
| 2511 | * @param int $object_id Object ID. |
| 2512 | * @param int $tt_id Term taxonomy ID. |
| 2513 | * @param string $taxonomy Taxonomy slug. |
| 2514 | */ |
| 2515 | do_action( 'added_term_relationship', $object_id, $tt_id, $taxonomy ); |
| 2516 | $new_tt_ids[] = $tt_id; |
| 2517 | } |
| 2518 | |
| 2519 | if ( $new_tt_ids ) { |
| 2520 | wp_update_term_count( $new_tt_ids, $taxonomy ); |
| 2521 | } |
| 2522 | |
| 2523 | if ( ! $append ) { |
| 2524 | $delete_tt_ids = array_diff( $old_tt_ids, $tt_ids ); |