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bool PDO::beginTransaction ( void )

<?php
/* Begin a transaction, turning off autocommit */
$dbh->beginTransaction();

/* Modify database schema and data */
$sth = $dbh->exec("DROP TABLE fruit");
$sth = $dbh->exec("UPDATE dessert
    SET name = 'hamburger'");

/* Detect error and roll back changes */
$dbh->rollBack();

/* Database connection is now back to autocommit mode */
?>