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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 |
|---|---|
| 2641 | * Fires immediately before an object-term relationship is added. |
| 2642 | * |
| 2643 | * @since 2.9.0 |
| 2644 | * @since 4.7.0 Added the `$taxonomy` parameter. |
| 2645 | * |
| 2646 | * @param int $object_id Object ID. |
| 2647 | * @param int $tt_id Term taxonomy ID. |
| 2648 | * @param string $taxonomy Taxonomy slug. |
| 2649 | */ |
| 2650 | do_action( 'add_term_relationship', $object_id, $tt_id, $taxonomy ); |
| 2651 | |
| 2652 | $wpdb->insert( |
| 2653 | $wpdb->term_relationships, |
| 2654 | array( |
| 2655 | 'object_id' => $object_id, |
| 2656 | 'term_taxonomy_id' => $tt_id, |
| 2657 | ) |
| 2658 | ); |
| 2659 | |