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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 |
|---|---|
| 2949 | * Fires immediately before an object-term relationship is deleted. |
| 2950 | * |
| 2951 | * @since 2.9.0 |
| 2952 | * @since 4.7.0 Added the `$taxonomy` parameter. |
| 2953 | * |
| 2954 | * @param int $object_id Object ID. |
| 2955 | * @param array $tt_ids An array of term taxonomy IDs. |
| 2956 | * @param string $taxonomy Taxonomy slug. |
| 2957 | */ |
| 2958 | do_action( 'delete_term_relationships', $object_id, $tt_ids, $taxonomy ); |
| 2959 | |
| 2960 | $deleted = $wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->term_relationships WHERE object_id = %d AND term_taxonomy_id IN ($in_tt_ids)", $object_id ) ); |
| 2961 | |
| 2962 | wp_cache_delete( $object_id, $taxonomy . '_relationships' ); |
| 2963 | wp_cache_delete( 'last_changed', 'terms' ); |
| 2964 | |
| 2965 | /** |
| 2966 | * Fires immediately after an object-term relationship is deleted. |
| 2967 | * |