Get Last Insert Id in magento

$connection    = Mage::getSingleton(’core/resource’)->getConnection(’core_write’);
$sql         = "INSERT INTO `table` SET field1 = ?, field2 = ?, ...";
$connection->query($sql, array($field1_value, $field2_value, ...));
$lastInsertId = $connection->lastInsertId();
echo $lastInsertId;