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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 |
|---|---|
| 2315 | * Fires immediately after an object-term relationship is added. |
| 2316 | * |
| 2317 | * @since 2.9.0 |
| 2318 | * @since 4.7.0 Added the `$taxonomy` parameter. |
| 2319 | * |
| 2320 | * @param int $object_id Object ID. |
| 2321 | * @param int $tt_id Term taxonomy ID. |
| 2322 | * @param string $taxonomy Taxonomy slug. |
| 2323 | */ |
| 2324 | do_action( 'added_term_relationship', $object_id, $tt_id, $taxonomy ); |
| 2325 | $new_tt_ids[] = $tt_id; |
| 2326 | } |
| 2327 | |
| 2328 | if ( $new_tt_ids ) |
| 2329 | wp_update_term_count( $new_tt_ids, $taxonomy ); |
| 2330 | |
| 2331 | if ( ! $append ) { |
| 2332 | $delete_tt_ids = array_diff( $old_tt_ids, $tt_ids ); |
| 2333 | |