sokil / php-mongo

        // If the w parameter is set to acknowledge the write,

        // returns an associative array with the status of the inserts ("ok")

        // and any error that may have occurred ("err").

        if(is_array($result)) {

            if($result['ok'] != 1) {

                throw new Exception('Batch insert error: ' . $result['err']);

            }

            return $this;

        }

        // Otherwise, returns TRUE if the batch insert was successfully sent,

        // FALSE otherwise.

        );

        // if write concern acknowledged

        if(is_array($result)) {

            if($result['ok'] != 1) {

                throw new Exception(sprintf('Update error: %s: %s', $result['err'], $result['errmsg']));

            }

            return $this;

        }

        // if write concern unacknowledged

        if(!$result) {

            $result = $targetMongoCollection->batchInsert($documentList);

            // check result

            if(is_array($result)) {

                if($result['ok'] != 1) {

                    throw new Exception('Batch insert error: ' . $result['err']);

                }

            } elseif(!$result) {

                throw new Exception('Batch insert error');

            }

        }

        return $this;