(no version information, might be only in CVS)
Rolls back a transaction
( void )
Rolls back the current transaction, as initiated by
PDO::beginTransaction(). It is an error to call this
method if no transaction is active.
If the database was set to autocommit mode, this function will restore
autocommit mode after it has rolled back the transaction.
Some databases, including MySQL, automatically issue an implicit
COMMIT when a database definition language (DDL) statement such as
DROP TABLE or CREATE TABLE is issued within a transaction. The implicit
COMMIT will prevent you from rolling back any other changes within the