php同时使用session和cookie来保存用户登录信息的实现代码

<?php

final class userlogin {

 public function __construct() {
  
 }

 public static function getuserinfo() {
  if (isset($_cookie["user_id"])&&$_cookie["user_id"]&&(trim($_cookie["user_id"])!="")) {
   if (isset($_session["user_info"]))
    return $_session["user_info"];
   $dao = new userdao();
   $user = $dao->find($_cookie["user_id"]);
   if ($user) {
    $_session["user_info"] = $user;
    setcookie("docloud_sid", session_id(), time() + 36000);
    setcookie("user_id", $_cookie["user_id"], time() + 36000);
    
    if (array_key_exists("selected_prj_id", $_cookie))
     setcookie("selected_prj_id", $_cookie["selected_prj_id"], time() + 36000);
    
    if (array_key_exists("selected_class_id", $_cookie))
     setcookie("selected_class_id", $_cookie["selected_class_id"], time() + 36000);
    
    if (array_key_exists("selected_image_id", $_cookie))
     setcookie("selected_image_id", $_cookie["selected_image_id"], time() + 36000);
    
    if (array_key_exists("test_image_ids", $_cookie))
     setcookie("test_image_ids", $_cookie["test_image_ids"], time() + 36000);
    
    if (array_key_exists("upload_image_ids", $_cookie))
     setcookie("upload_image_ids", $_cookie["upload_image_ids"], time() + 36000);
    return $user;
   }
  }
  self::clearcookie();
  return null;
 }

 public static function setuserinfo($userinfo) {
  $_session["user_info"] = $userinfo;
  setcookie("docloud_sid", session_id(), time() + 36000);
  setcookie("user_id", $userinfo->getid(), time() + 36000);
 }

 public static function islogin() {
  if (self::getuserinfo()) {
   return true;
  }
  return false;
 }

 public static function deluserinfo() {
  self::clearcookie();
  session_destroy();
 }
 
 private static function clearcookie() {
  setcookie("docloud_sid", "", time() - 36000);
  setcookie("user_id", "", time() - 36000);
  setcookie("selected_prj_id", "", time() - 36000);
  setcookie("selected_class_id", "", time() - 36000);
  setcookie("selected_image_id", "", time() - 36000);
  setcookie("test_image_ids", "", time() - 36000);
  setcookie("upload_image_ids", "", time() - 36000);
 }

}

?>

<?php
require_once 'init.php';

// if logged in, logout
if (userlogin::islogin() && $_cookie["user_id"]==1) {
 userlogin::deluserinfo();
}
else if (userlogin::islogin()){
 utils::redirect('welcome');
}

$username = null;
$password = null;

$msg = "";

if (isset($_post['username']) && isset($_post['password'])) {
 $username = addslashes(trim(stripslashes($_post ['username'])));
 $password = addslashes(trim(stripslashes($_post ['password'])));
 // validate
 $errors = loginvalidator::validate($username, $password);
 
 if (empty($errors)) {
  // save
  $dao = new userdao();
  $user = $dao->findbyname($username);
  $last_login_ip = utils::getipaddress();
  $user->setlastloginip($last_login_ip);
  $now = new datetime();
  $user->setlastlogintime($now);
  $dao->save($user);
  userlogin::setuserinfo($user);
  flash::addflash('登录成功！');
  utils::redirect('welcome');
 }
 
 foreach ($errors as $e) {
  $msg .= $e->getmessage()."<br>";
 }
}

?>