PDO连接mysql数据库

<?php

header("Content-Type: text/html;charset=utf-8");
$dbType='mysql';
$host='localhost';
$dbName='baimam';
$userName='baimam';
$password='baimam';

$dns = "{$dbType}:host={$host};dbName={$dbName}";
try{
$pdo = new PDO($dns,$userName,$password);
echo '<h3>连接成功！</h3>';
}
catch(PDOException $e){
die('操作失败'.$e->getMessage());
}
unset($pdo);