PHP/MySQLi & Transactions

I have been playing around with running transactions with MySQLi and PHP, below is the basic format I've gotten to so far. Is there a better more standardised way to format transactions in PHP and is there a need to use $vConn->autocommit(TRUE) or does commit() set autocommit back to TRUE once it's run?

Thanks in advance for the help/advice.

<?php
$vTransactionCompleted = false;

// Custom class to open DB connection
$vConn = $dbObj->open();

$vConn->autocommit(FALSE);

try {
	$vConn->query("INSERT INTO Language VALUES ('DEU', 'Bavarian', 'F', 11.2)");
	$vConn->query("INSERT INTO Language VALUES ('DEU', 'Swabian', 'F', 9.4)");

	if ($vConn->commit())
		$vTransactionCompleted = true;
}
catch(Exception $e)
{
	$vConn->rollback();
}

$vConn->autocommit(TRUE);

// Custom class to close DB connection
$dbObj->close($vConn);

if ($vTransactionCompleted)
	echo "Transaction was successful.";
else
	echo "Transaction failed.";
?>

Edit: Found out one answer about setting autocommit back to TRUE, http://www.php.net/manual/en/mysqli.commit.php#89976