本文通过一个简单的实例完成了完整的PHP+MySQL会员系统功能。是非常实用的一个应用。具体实现步骤如下:
一、会员系统的原理:
登陆-->判断-->保持状态(Cookie或Session)-->验证状态及其权限
二、会员系统的安全:
1、学会使用常量提高md5安全性
2、Cookie/ Session 少用明文信息
3、Session安全性要大于Cookie
4、使用Cookie/ Session读取信息 尽量增加判断信息
5、Cookie/ Session内容要精简
6、对于错误信息及时销毁Cookie/ Session
三、数据库test,表user_list,及其字段
uid m_id username password
1 1 admin 291760f98414679e3fd3f9051b19b6f7
2 2 admin2 895785cfa5d8157f4d33c58ae0f55123
password:分别为md5(admintest100)、md5(admin2test100)即密码是与常量test100绑定后,再经过加密储存到数据库中的,这一步可以在注册时设置。
四、配置页面m_config.php:
<?php session_start(); //数据库连接 $conn=mysql_connect('localhost','root',''); mysql_select_db('test',$conn); //定义常量 define(ALL_ps,"test100"); //查看登录状态与权限 function user_shell($uid,$shell,$m_id){ $sql="select * from user_list where `uid`='$uid'"; $query=mysql_query($sql); $us=is_array($row=mysql_fetch_array($query)); $shell=$us ? $shell==md5($row[username].$row[password].ALL_PS):FALSE; if($shell){ if($row[m_id]<=$m_id){//$row[m_id]越小权限越高,为1时权限最高 return $row; }else{ echo "你的权限不足,不能查看该页面"; exit(); } }else{ echo "登录后才能查看该页"; exit(); } } //设置登录超时 function user_mktime($onlinetime){ $new_time=mktime(); echo $new_time-$onlinetime."秒未操作该页面"."<br>"; if($new_time-$onlinetime>'10'){//设置超时时间为10秒,测试用 echo "登录超时,请重新登录"; exit(); session_destroy(); }else{ $_SESSION[times]=mktime(); } } ?>
五、登录页面m_user.php:
<?php include("m_config.php"); //echo md5("admin2".ALL_PS); if($_POST[submit]){ $username=str_replace(" ","","$_POST[username]"); $sql="select * from user_list where `username`='$username'"; $query=mysql_query($sql); $us=is_array($row=mysql_fetch_array($query)); $ps=$us ? md5($_POST[password].ALL_PS)==$row[password] : FALSE; if($ps){ $_SESSION[uid]=$row[uid]; $_SESSION[user_shell]=md5($row[username].$row[password].ALL_PS); $_SESSION[times]=mktime();//取得登录时忘该的时间 echo "登录成功"; }else{ echo "用户名或密码错误"; session_destroy();//密码错误时消除所有的session } } ?> <form action="" method="post"> 用户名:<input name="username" type="text" /><br /> 用户名:<input name="password" type="password" /><br /> 验证码:<input name="code" type="code" />5213<br /><br /> <input name="submit" type="submit" value="登录" /> </form>
六、设置了权限及超时的页面m_zhuangtai.php:
<?php include("m_config.php"); $arr=user_shell($_SESSION[uid],$_SESSION[user_shell],1);//设置该页面只有权限为1时即最高权限的才能访问 user_mktime($_SESSION[times]);//判断是否超时10秒 //echo $_SESSION[times]."<br>";//登录时该的时间 //echo mktime()."<br>";//当前日期 //echo $arr[username]."<br>"; //echo $arr[uid]."<br>"; ?>
有权限方能查看的内容
七、测试结果:
1、用sss,sssssss登录,提示:用户名或密码错误。查看m_zhuangtai.php,提示:登录后才能查看该页。
2、用admin admin登录后,因为权限为1,所以可以查看m_zhuangtai.php页面的内容。
3、用admin admin登录后,因为权限为1,所以可以查看m_zhuangtai.php页面的内容,但10秒后再刷新,提示:X秒未操作该页面 登录超时,请重新登录。
4、用admin2 admin2登录后,因为权限为2,所以无法查看m_zhuangtai.php页面的内容,提示:你的权限不足,不能查看该页面。
希望本文所述实例对大家PHP程序开发有所帮助。

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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