PHP事务的怎么写

PHP事务的如何写?
PHP 的事务怎么写? 我现在是一条update,一条insert
代码如下,错误是,值类型发生了错误,事务没起作用.

$db = new DbManager();<br />
	$conn = $db->getConnection();<br />
	$conn->set_charset("utf8");<br />
	<br />
	if(mysqli_connect_errno())<br />
	{<br />
		echo 'error connect database! please content manager!';<br />
		exit;<br />
	}<br />
	//echo connection_status();<br />
	$tbNums = explode(',',$tbNum);<br />
	<br />
	$conn->autocommit(FALSE);<br />
	$flag = true;<br />
	$a=0;<br />
	foreach($tbNums as $key => $value)<br />
	{<br />
		$updateBalance = "UPDATE T_SMS_TBNUM SET STATUS = 2 WHERE ID = ?";<br />
		$insertRelate = "INSERT INTO T_SMS_TBNUMRELATE (TBID,OWNCLIENTID,REALFEE,CREATETIME) VALUES(?,?,?,?)";<br />
		<br />
		<br />
		$stmtUpdateClient = $conn->prepare($updateBalance);<br />
		$stmtUpdateClient->bind_param('i',$value);<br />
		$ss = $stmtUpdateClient->execute();<br />
		<br />
		$stmt = $conn->prepare($insertRelate);<br />
		$foura = 4;<br />
		$a++;<br />
		if($a!=0){<br />
			$value = 's';<br />
		}<br />
		$stmt->bind_param('iids',$value,$clientId,$foura,date('Y-m-d H:i:s'));<br />
		$boooo = $stmt->execute();<br />
		echo $ss.'+'.$boooo;<br />
		if($stmtUpdateClient->affected_rows <= 0 || $stmt->affected_rows <= 0)<br />
		{<br />
			echo $stmtUpdateClient->affected_rows.'|'.$stmt->affected_rows;<br />
			$flag = false;<br />
			break;<br />
		}<br />
	}<br />
		if(!$flag)<br />
		{<br />
			$conn ->rollback();<br />
			$conn -> autocommit(TRUE);<br />
			$conn->close();<br />
			return 'paylog false!';<br />
		}else<br />
		{<br />
			$conn->commit();<br />
			$conn -> autocommit(TRUE);<br />
			$conn->close();<br />
			return '1';<br />
		}

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------解决方案--------------------

if( $stmt->affected_rows <= 0 <br><font color='#FF8000'>------解决方案--------------------</font><br>  ($masterId && $stmtLower->affected_rows <= 0))<br />
		{<br />
					$conn ->rollback();<br />
					$conn -> autocommit(TRUE);<br />
					$conn->close();<br />
			return 'unknow_error';<br />
		}else<br />
		{<br />
					$conn->commit();<br />
					$conn -> autocommit(TRUE);<br />
					$conn->close();<br />
			return '1';<br />
		}