phpmyadmin / sql-parser

                    $lastTransaction = $statement;

                    $this->statements[] = $statement;

                } elseif ($statement->type === TransactionStatement::TYPE_END) {

                    if ($lastTransaction === null) {

                        // Even though an error occurred, the query is being

                        // saved.

                        $this->statements[] = $statement;

                        $this->error(

                            'No transaction was previously started.',

                            $token

                        );

                    } else {

                        $lastTransaction->end = $statement;

                    }

                    $lastTransaction = null;

                }

            $statement->validateClauseOrder($this, $list);

            // Finally, storing the statement.

            if ($lastTransaction !== null) {

                $lastTransaction->statements[] = $statement;

            } else {

                $this->statements[] = $statement;

            }

            $lastStatement = $statement;

        }

    }