1

我目前正在学习 PHP 和 MySQL，我一直在学习一个基本的（虽然是旧的）登录脚本教程——我遇到了各种贬值的函数等等，我正在努力改进这个脚本。

我想为我的脚本添加不同的访问级别，例如管理员和用户。我在“用户”表中添加了一行，名为“访问”，用户的访问权限为“1”，管理员的访问权限为“9”。

经过一些初步研究后，似乎我需要能够将用户访问级别存储在会话变量中 - 这是正确的方法吗？如果是这样，当用户登录时，我将如何最初检索它？

一旦访问级别存储在会话变量中，我将如何限制对页面的访问 - 也许使用标头重定向？

这是我在 functions.php 中使用的当前代码

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;
    }
    }

而从 login.php

if(isset($_POST['sublogin'])){
   /* Check that all fields were typed in */
   if(!$_POST['user'] || !$_POST['pass']){
      $errors .= "You didn't fill in a required field.<br/>\n";

   }


else{

    /* Once all fields are entered - perform form validation */


   /* Checks that username is in database and password is correct */
   $md5pass = md5($_POST['pass']);
   $result = confirmUser($_POST['user'], $md5pass);

   /* Check error codes */
   if($result == 1){
      $user_errors .= "That username doesn't exist in our database.<br/>\n";
   }
   else if($result == 2){
      $pass_errors .= "Incorrect password, please try again.<br/>\n";
   }


   /* Username and password correct, register session variables */
   if (empty($errors) && empty($user_errors) && empty($pass_errors)){
        $_POST['user'] = mysql_real_escape_string($_POST['user']);
        $_SESSION['username'] = $_POST['user'];
        $_SESSION['password'] = $md5pass;
        /* Quick self-redirect to avoid resending data on refresh */
        echo "<META HTTP-EQUIV='refresh' CONTENT='0;URL=index.php'>";
   } 



   /**
    * This is the cool part: the user has requested that we remember that
    * and one to hold his md5 encrypted password. We set them both to
    * he's logged in, so we set two cookies. One to hold his username,
    * 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, "/");
    }

    //return;
}
}

任何帮助将不胜感激，因为我已经坚持了几天了，谢谢。

4

2 回答 2

1

在用户表中为不同类型的用户分配不同的角色 ID。有一个上下文表，它将存储不同文件路径的信息（最好是文件夹中所需层次结构的最顶层）。还有一个表，其中包含角色和不同文件路径之间的映射（即允许哪种类型的用户访问哪个路径）
现在在受限文件的顶部，有一个 util 方法，它将接受 __FILE__ 路径和角色 id 并告诉是否用户是否具有访问权限，从而采取相关措施。因此，您只需要将角色 ID 存储在会话变量中。

于 2011-11-01T19:16:24.037 回答
1

所以这个 ex 假设您正在检查 PHP 中角色的限制资源，而不是来自数据库。这可以很容易地改变，但我想我会让这个 ex 有点简单。

架构：

users
-------
id_user
identity
credential
role
... other fields

帐户创建

不要使用 md5，它很容易实现，也很容易克服。sha 只是更安全一点，不需要额外的工作。

$email_or_username = "francis@yaconiello.com";
$password = "PinkEleph4nt"; // not my real password for anything
$role = "admin";
$sql = sprintf("INSERT INTO users SET identity='%s', credential='%s', role='%s'",
    mysql_real_escape_string($email_or_username), 
    mysql_real_escape_string(sha1($password)), 
    mysql_real_escape_string($role));

帐号登录

这是缩短的，我将查询放入，但不是很多数据库逻辑，根据需要编写它，阅读评论。

// VALIDATE THE EMAIL/USERNAME and PASSWORD

if($is_valid == TRUE)
{
    $sql = sprintf("SELECT id_user FROM users WHERE identity='%s' AND credential='%s' LIMIT 1",
        mysql_real_escape_string($email_or_username), 
        mysql_real_escape_string(sha1($password)));

    // FETCH ROW save into $row

    if(!empty($row))
    {
        // A user was fetched save it into the session
        $_SESSION['id_user'] = $row['id_user'];

        // SUCCESS
    }
    else
    {
        // FAILURE
    }
}

检查用户的角色

<?php
function fetch_role()
{
    $role = "guest";
    if(isset($_SESSION['id_user']))
    {
        // User exists
        $sql = sprintf("SELECT * FROM users WHERE id_user='%s' LIMIT 1",
            mysql_real_escape_string($_SESSION['id_user']));

        // RUN THE MYSQL QUERY TO FETCH THE USER, SAVE INTO $row

        if(!empty($row))
        {
            $role = $user_row['role'];
        }
    }

    return $role;
}

...

$role = fetch_role();
if($role == 'guest')
{
    // SHOW GUEST CONTENT
}
elseif($role == 'member')
{
    // SHOW OTHER CONTENT
}
elseif($role == 'admin')
{
    // SHOW ADMIN CONTENT
}
于 2011-11-01T19:52:19.427 回答