在登陆界面实现Remember me功能

登陆form中有：

 Remember me next time

设置session之后需要设置cookie。cookie就是临时存储用户信息的文件，保存在用户机器上。一下代码位于登陆中验证用户通过后：

   /* Username and password correct, register session variables */
 $user = stripslashes($_POST['user']);
 $_SESSION['username'] = $user;
 $_SESSION['password'] = $pass;

 /**
  * the user has requested that we remember that he's logged in, so
  * we set two cookies. One to hold his username,
  * and one to hold his password. We set them both to
  * expire in 100 days. Now, next time he comes to our site, we will
  * log him in automatically.
  */
 if(isset($_POST['remember'])){
    setcookie("cookname", $_SESSION['username'], time()+60*60*24*100, "/");
    setcookie("cookpass", $_SESSION['password'], time()+60*60*24*100, "/");
 }
检查是否设置cookie：
function checkLogin(){
 /* Check if user has been remembered */
 if(isset($_COOKIE['cookname']) && isset($_COOKIE['cookpass'])){
    $_SESSION['username'] = $_COOKIE['cookname'];
    $_SESSION['password'] = $_COOKIE['cookpass'];
 }

 /* Username and password have been set */
 if(isset($_SESSION['username']) && isset($_SESSION['password'])){
    /* Confirm that username and password are valid */
    if(confirmUser($_SESSION['username'], $_SESSION['password']) != 0){
       /* Variables are incorrect, user not logged in */
       unset($_SESSION['username']);
       unset($_SESSION['password']);
       return false;
    }
    return true;
 }
 /* User not logged in */
 else{
    return false;
 }
}

在logout的时候

if(isset($_COOKIE['cookname']) && isset($_COOKIE['cookpass'])){
 setcookie("cookname", "", time()-60*60*24*100, "/");
 setcookie("cookpass", "", time()-60*60*24*100, "/");
}
参考：http://evolt.org/article/comment/17/60265/index.html