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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 |
|---|---|
| 2873 | * Fires immediately before an object-term relationship is deleted. |
| 2874 | * |
| 2875 | * @since 2.9.0 |
| 2876 | * @since 4.7.0 Added the `$taxonomy` parameter. |
| 2877 | * |
| 2878 | * @param int $object_id Object ID. |
| 2879 | * @param array $tt_ids An array of term taxonomy IDs. |
| 2880 | * @param string $taxonomy Taxonomy slug. |
| 2881 | */ |
| 2882 | do_action( 'delete_term_relationships', $object_id, $tt_ids, $taxonomy ); |
| 2883 | |
| 2884 | $deleted = $wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->term_relationships WHERE object_id = %d AND term_taxonomy_id IN ($in_tt_ids)", $object_id ) ); |
| 2885 | |
| 2886 | wp_cache_delete( $object_id, $taxonomy . '_relationships' ); |
| 2887 | wp_cache_delete( 'last_changed', 'terms' ); |
| 2888 | |
| 2889 | /** |
| 2890 | * Fires immediately after an object-term relationship is deleted. |
| 2891 | * |