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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 |
|---|---|
| 2255 | * Fires immediately before an object-term relationship is added. |
| 2256 | * |
| 2257 | * @since 2.9.0 |
| 2258 | * @since 4.7.0 Added the `$taxonomy` parameter. |
| 2259 | * |
| 2260 | * @param int $object_id Object ID. |
| 2261 | * @param int $tt_id Term taxonomy ID. |
| 2262 | * @param string $taxonomy Taxonomy slug. |
| 2263 | */ |
| 2264 | do_action( 'add_term_relationship', $object_id, $tt_id, $taxonomy ); |
| 2265 | $wpdb->insert( $wpdb->term_relationships, array( 'object_id' => $object_id, 'term_taxonomy_id' => $tt_id ) ); |
| 2266 | |
| 2267 | /** |
| 2268 | * Fires immediately after an object-term relationship is added. |
| 2269 | * |
| 2270 | * @since 2.9.0 |
| 2271 | * @since 4.7.0 Added the `$taxonomy` parameter. |
| 2272 | * |
| 2273 | * @param int $object_id Object ID. |