<?php//接收页面$mysqli=new Mysqli('localhost','root','root','test');if($mysqli->connect_errno){    die('Connect Error:'.$mysqli->connect_error);}@$mysqli->set_charset('utf8');@$username=$_POST['username'];@$username=$mysqli->escape_string($username);@$password=$_POST['password'];@$age=$_POST['age'];@$act=$_GET['act'];@$id=$_GET['id'];//根据不同的操作完成不同的执行不同代码//$sql="insert user1(username,password)values('asd','asda')";switch ($act){    case 'addUser':       $sql="insert user1(username,password,age)values('$username','$password','$age')";        goto query;        break;   case 'delUser':       $sql="delete from user1 where id=$id";       goto query;        break;   case 'editUser':       $sql="update user1 set username='$username', password='$password', age=$age where id=$id";       goto query;        break;       query:       $res=$mysqli->query($sql);       header("location:http://localhost/PHP1/mysqli/userList/userList.php");}