transaction in mysql using php example

<?php
function begin()
{
mysql_query("BEGIN");
}

function commit()
{
mysql_query("COMMIT");
}

function rollback()
{
mysql_query("ROLLBACK");
}

mysql_connect("localhost","Dude1", "SuperSecret") or die(mysql_error());

mysql_select_db("bedrock") or die(mysql_error());

$query = "INSERT INTO employee (ssn,name,phone) values ('123-45-6789','Matt','1-800-555-1212')";

begin(); // transaction begins

$result = mysql_query($query);

if(!$result)
{
rollback(); // transaction rolls back
echo "transaction rolled back";
exit;
}
else
{
commit(); // transaction is committed
echo "Database transaction was successful";
}

?>