Habari\Vocabulary::delete_term PHP Method

    public function delete_term($term)
    {
        if (!is_object($term)) {
            $term = $this->get_term($term);
        }
        // TODO How should we handle deletion of a term with descendants?
        // Perhaps a $keep_children flag to move descendants to be descendants of
        // the deleted term's parent? Terms should not change the left and right
        // values of other terms, and thus their deletion should only occur through
        // the vocabulary to which they belong. Is it feasible to restrict this?
        // For the moment, just delete the descendants
        $params = array($this->id, $term->mptt_left, $term->mptt_right);
        DB::query('DELETE from {terms} WHERE vocabulary_id=? AND mptt_left>? AND mptt_right<?', $params);
        // Fix mptt_left and mptt_right values for other nodes in the vocabulary
        $offset = $term->mptt_right - $term->mptt_left + 1;
        $ref = $this->mptt_left;
        $params = array($offset, $this->id, $term->mptt_left);
        // Delete the term
        $term->delete();
        // Renumber left and right values of other nodes appropriately
        DB::query('UPDATE {terms} SET mptt_right=mptt_right-? WHERE vocabulary_id=? AND mptt_right>?', $params);
        DB::query('UPDATE {terms} SET mptt_left=mptt_left-? WHERE vocabulary_id=? AND mptt_left>?', $params);
    }