PHP教程之实战用户模块开发

    //设置
    setcookie("key","val", time()+3600*24,"/");
    setcookie("key","val", time()+3600*24,"/","school.com");
    //删除
    setcookie("key","val", time()-1,"/");
    //读取
    $_COOKIE["key"];

    session_start();
    $_SESSION["key"]="val";
    unset($_SESSION["key"]);

    CREATE TABLE `sky_user` (
      `userid` int(10) unsigned NOT NULL AUTO_INCREMENT,
      `username` varchar(32) NOT NULL DEFAULT '',
      `nickname` varchar(32) NOT NULL DEFAULT '',
      `password` varchar(32) NOT NULL DEFAULT '',
      PRIMARY KEY (`userid`)
    ) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8mb4;

<?php
session_start();
$a=isset($_GET["a"])?htmlspecialchars($_GET["a"]):"index";
require "db.class.php";
$user=new User($db);
$user->$a();
class User{
  public $db;
  public function __construct($db){
      $this->db=$db;
  }
  public function Index(){
     
    $this->tokenLogin();
    require "tpl/index.php";
  }
  public function Login(){
    
    require "tpl/login.php";
  }
  public function LoginSave(){
    $username=$_POST["username"];
    $password=$_POST["password"];
    if(empty($username) ){
      $msg="用户名不能为空";
      require "tpl/msg.php";
      exit;
    }
    $row=$this->db->getRow("select * from sky_user where username='".$username."' ");
    if(!$row){
      $msg="用户名{$username}不存在";
      require "tpl/msg.php";
      exit;
    }
    if(md5($password)!=$row["password"] ){
      $msg="账户密码出错";
      require "tpl/msg.php";
      exit;
    }
    
    $msg="登录成功";
    $_SESSION["ssuser"]=array(
      "userid"=>$row["userid"],
      "nickname"=>$row["nickname"]
    );
    //实现记住账号功能
    $token=$row["userid"].".".md5($row["userid"].$row["password"]);
    setcookie("ssToken",$token,time()+3600*24,"/");
    require "tpl/msg.php";
  }
  public function tokenLogin(){
    if(!isset($_SESSION["ssuser"])){
      if(isset($_COOKIE["ssToken"])){
        $token=$_COOKIE["ssToken"];
        $arr=explode(".",$token);
        $row=$this->db->getRow("select * from sky_user where userid='".intval($arr[0])."' ");
        if($arr[1]==md5($row["userid"].$row["password"])){
          $_SESSION["ssuser"]=array(
            "userid"=>$row["userid"],
            "nickname"=>$row["nickname"]
          );
        }
      }
    }
  }
  public function register(){
    require "tpl/register.php";
  }
  public function registerSave(){
    $username=$_POST["username"];
    $nickname=$_POST["nickname"];
    $password=$_POST["password"];
    $password2=$_POST["password2"];
    if(empty($username) || empty($nickname)){
      $msg="用户名或者昵称不能为空";
      require "tpl/msg.php";
      exit;
    }
    $row=$this->db->getRow("select * from sky_user where username='".$username."' or nickname='".$nickname."' ");
    
    if($row){
      $msg="用户名或者昵称已经存在";
      require "tpl/msg.php";
      exit;
    }
    if($password!=$password2){
      $msg="两次密码输入不一致";
      require "tpl/msg.php";
      exit;
    }
    $sql="insert into sky_user set
        username='".$username."',
        nickname='".$nickname."',
        password='".md5($password)."'
    ";
    $this->db->insert($sql);
    $msg="注册成功";
    require "tpl/msg.php";
    exit;
  }
  public function loginOut(){
    unset($_SESSION["ssuser"]);
    setcookie("ssToken",0,time()-10,"/");
    $msg="注销成功";
    require "tpl/msg.php";
  }
  
}