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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 |
|---|---|
| 2163 | $term_order = 0; |
| 2164 | $final_tt_ids = wp_get_object_terms($object_id, $taxonomy, array('fields' => 'tt_ids')); |
| 2165 | foreach ( $tt_ids as $tt_id ) |
| 2166 | if ( in_array($tt_id, $final_tt_ids) ) |
| 2167 | $values[] = $wpdb->prepare( "(%d, %d, %d)", $object_id, $tt_id, ++$term_order); |
| 2168 | if ( $values ) |
| 2169 | $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)"); |
| 2170 | } |
| 2171 | |
| 2172 | do_action('set_object_terms', $object_id, $terms, $tt_ids, $taxonomy, $append, $old_tt_ids); |
| 2173 | return $tt_ids; |
| 2174 | } |
| 2175 | |
| 2176 | /** |
| 2177 | * Will make slug unique, if it isn't already. |
| 2178 | * |
| 2179 | * The $slug has to be unique global to every taxonomy, meaning that one |
| 2180 | * taxonomy term can't have a matching slug with another taxonomy term. Each |
| 2181 | * slug has to be globally unique for every taxonomy. |