Habari\Vocabulary::move_term PHP Метод

    public function move_term($term, $target_term = null, $before = false)
    {
        // We assume that the arguments passed are valid terms. Check them before calling this.
        // If there are terms in the vocabulary, work out the reference point
        if (!$this->is_empty()) {
            $source_left = $term->mptt_left;
            $source_right = $term->mptt_right;
            $range = $source_right - $source_left + 1;
            DB::begin_transaction();
            // Determine the insertion point mptt_target
            if ($target_term == null) {
                // if no target is specified, put the new term after the last term
                $mptt_target = DB::get_value('SELECT MAX(mptt_right) FROM {terms} WHERE vocabulary_id = :id', array(':id' => $this->id));
                $mptt_target = $mptt_target + 1;
                // the left is one greater than the highest right
            } else {
                // if we're putting it before
                if ($before) {
                    $mptt_target = $target_term->mptt_left;
                    // we're actually taking the place of the target term's left
                } else {
                    $mptt_target = $target_term->mptt_right + 1;
                    // we just need to start at the next number
                }
            }
            // Create space in the tree for the insertion
            $params = array('vocab_id' => $this->id, 'range' => $range, 'mptt_target' => $mptt_target);
            $res = DB::query('UPDATE {terms} SET mptt_left = mptt_left + :range WHERE vocabulary_id = :vocab_id AND mptt_left >= :mptt_target', $params);
            if (!$res) {
                DB::rollback();
                return false;
            }
            $res = DB::query('UPDATE {terms} SET mptt_right = mptt_right + :range WHERE vocabulary_id = :vocab_id AND mptt_right >= :mptt_target', $params);
            if (!$res) {
                DB::rollback();
                return false;
            }
            // if we're moving it "down" ("forward"?) in the vocabulary, we just created a gap that changed our term's left and right values
            if ($mptt_target < $source_left) {
                $source_left = $source_left + $range;
                $source_right = $source_right + $range;
            }
            // figure out how far our nodes are moving
            $offset = $mptt_target - $source_left;
            // move our lucky nodes into the space we just created
            $params = array(':offset' => $offset, ':vocab_id' => $this->id, ':source_left' => $source_left, ':source_right' => $source_right);
            $res = DB::query('
				UPDATE {terms}
				SET
					mptt_left = mptt_left + :offset,
					mptt_right = mptt_right + :offset
				WHERE
					vocabulary_id = :vocab_id AND
					mptt_left >= :source_left AND
					mptt_right <= :source_right
				', $params);
            // Close the gap in the tree created by moving those nodes out
            $params = array('range' => $range, 'vocab_id' => $this->id, 'source_left' => $source_left);
            $res = DB::query('UPDATE {terms} SET mptt_left = mptt_left - :range WHERE vocabulary_id = :vocab_id AND mptt_left > :source_left', $params);
            if (!$res) {
                DB::rollback();
                return false;
            }
            $params = array('range' => $range, 'vocab_id' => $this->id, 'source_right' => $source_right);
            $res = DB::query('UPDATE {terms} SET mptt_right = mptt_right - :range WHERE vocabulary_id = :vocab_id AND mptt_right > :source_right', $params);
            if (!$res) {
                DB::rollback();
                return false;
            }
            // Success!
            DB::commit();
            return $this->get_term($term->id);
        }
        return false;
    }