PHP PDO的使用

<?php            乐杨俊
  $dbms='mysql';
  $host='localhost';
  $dbName='test';
  $user='root';
  $pass='leyangjun';
  $dsn="$dbms:host=$host;dbname=$dbName"; try{
   $dbh=new PDO($dsn,$user,$pass,array(PDO::MYSQL_ATTR_INIT_COMMAND => "set names utf8"));
   echo"成功连接！<br/>";
   
   $result=$dbh->query('select * from timing_delivery');
   //var_dump($result);
   foreach($result as $row){
    echo"<pre>";
    print_r($row);
    echo "</pre>";
   }
  $dbh=null;
  }catch(PDOException $e){
   die("Error！连接失败：".$e->getMessage()."<br/>");
  }
 ?>