php连接数据库

1、首先在mysql中建一个数据库baixing,再建一个表user，里面有username、password两个字段主键默认为Id，见一下代码：

<?php/** * Created by PhpStorm. * User: Jing * Date: 2016/7/21 * Time: 17:09 */header("content-type:text/html;charset=utf-8");$host="localhost";$user="root";$password="root";$port=3306;$db="baixing";//顺序为$host,$user,$password,$db,$port$conn=new mysqli($host,$user,$password,$db,$port);if(!$conn){    die("error:".$conn->connect_error);}    $result=$conn->query("select * from user");    echo "数据库连接成功";    var_dump($result);     $conn->close();