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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 |
|---|---|
| 2234 | if ( in_array($tt_id, $final_tt_ids) ) |
| 2235 | $values[] = $wpdb->prepare( "(%d, %d, %d)", $object_id, $tt_id, ++$term_order); |
| 2236 | if ( $values ) |
| 2237 | if ( false === $wpdb->query( "INSERT INTO $wpdb->term_relationships (object_id, term_taxonomy_id, term_order) VALUES " . join( ',', $values ) . " ON DUPLICATE KEY UPDATE term_order = VALUES(term_order)" ) ) |
| 2238 | return new WP_Error( 'db_insert_error', __( 'Could not insert term relationship into the database' ), $wpdb->last_error ); |
| 2239 | } |
| 2240 | |
| 2241 | wp_cache_delete( $object_id, $taxonomy . '_relationships' ); |
| 2242 | |
| 2243 | do_action('set_object_terms', $object_id, $terms, $tt_ids, $taxonomy, $append, $old_tt_ids); |
| 2244 | return $tt_ids; |
| 2245 | } |
| 2246 | |
| 2247 | /** |
| 2248 | * Will make slug unique, if it isn't already. |
| 2249 | * |
| 2250 | * The $slug has to be unique global to every taxonomy, meaning that one |
| 2251 | * taxonomy term can't have a matching slug with another taxonomy term. Each |
| 2252 | * slug has to be globally unique for every taxonomy. |