February 12, 2011 
Definition:
function wp_delete_object_term_relationships( $object_id, $taxonomies ) {}
Will unlink the object from the taxonomy or taxonomies.
Will remove all relationships between the object and any terms in a particular taxonomy or taxonomies. Does not remove the term or taxonomy itself.
Parameters
- int $object_id: The term Object Id that refers to the term
- string|array $taxonomies: List of Taxonomy Names or single Taxonomy name.
Defined actions
- delete_term_relationships
do_action( 'delete_term_relationships', $object_id, $tt_ids ); - deleted_term_relationships
do_action( 'deleted_term_relationships', $object_id, $tt_ids );
Source code
function wp_delete_object_term_relationships( $object_id, $taxonomies ) {
global $wpdb;
$object_id = (int) $object_id;
if ( !is_array($taxonomies) )
$taxonomies = array($taxonomies);
foreach ( (array) $taxonomies as $taxonomy ) {
$tt_ids = wp_get_object_terms($object_id, $taxonomy, array('fields' => 'tt_ids'));
$in_tt_ids = "'" . implode("', '", $tt_ids) . "'";
do_action( 'delete_term_relationships', $object_id, $tt_ids );
$wpdb->query( $wpdb->prepare("DELETE FROM $wpdb->term_relationships WHERE object_id = %d AND term_taxonomy_id IN ($in_tt_ids)", $object_id) );
do_action( 'deleted_term_relationships', $object_id, $tt_ids );
wp_update_term_count($tt_ids, $taxonomy);
}
}
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