PHP の PDO の次のプログラムがエラーになるのはなぜですか?

<?phptry {	$dbh = new PDO('mysql:dbname=mytest;host=localhost', 'root', '19aeacv44899d4ff');		$query = 'INSERT INTO contactInfo(name, address, phone) VALUES(?, ?, ?)';	$stmt = $dbh->prepare($query);	$name 	 = '张某某';	$address = '海珠区';	$phone 	 = '15814535527';	$stmt->bindParam(1, $name);	$stmt->bindParam(2, $address);	$stmt->bindParam(3, $phone);	$stmt->execute();	if ($insertID = $dbh->lastInsertId()) {		echo $insertID.'<br />';	} else {		echo '插入出错！';		exit();	}} catch(PDOException $d) {	echo '数据库连接失败：'.$e->getMessage();	exit();}