连接数据库

<?php
/**
 * Created by PhpStorm.
 * User: ld
 * Date: 2022-04-11
 * Time: 14:25
 */
//1连接数据库
//$link=mysqli_connect('localhost','root','','test');
//2判读连接成功
//if(!$link)
//   echo "shibai";
//else
//   echo "chenggong";
//12合并
$link=mysqli_connect('localhost','root','','test')
or die("shibai");
//选择数据库
mysqli_select_db($link,'test');
//4设置字符集
mysqli_set_charset($link,'utf8');
//mysqli_query('set names utf8');
//5sql语句
$sql="select * from USER ";
//6发送sql
$result=mysqli_query($link,$sql);
//56合并
//7处理结果集
$row=mysqli_fetch_assoc($result);
var_dump($row);
//8关闭连接
mysqli_close($link);