php分层模式
此篇文字,写入5月1日,当时出于一些目的,学了php,在T字横线上发展了一下.
关于分层模式,最早学过C#,接触了三层架构,java中的MVC;java还有多层架构;在MVC之前有过model1,model2。今天想写写php,想照着java中的路子写,虽然都声称面向对象的语言,但是路数还是有差别。
分层的核心思想应该就是,解耦和,每层各司其职。
java中的多层架构:
数据持久层:DAO(data?access?object)或者还定义了一个IDAO接口;数据访问对象没有业务逻辑,针对每一张表或者说每一个实体的CRUD。框架有,dbutils(算不上框架,工具包),hibernate,ibatis->myibatis等。
Model层,还有人叫实体entity还有人叫bean,虽然它可以是个bean,个人认为bean的概念并不准确,bean的概念更广。这一层贯穿与整个系统,DAO将表数据转移到model对象中。与model携带数据传递。这一层就是要面向对象.
Service层,业务逻辑层:负责系统逻辑,控制事务,等;调用DAO完成数据持久化。其中web?service,cxf,hessian便是与这层相关的技术。
web层,显示数据与用户交互;可以由servlet,jsp(jsp之后也会被编译成servelt)担当;使用struts的话web层可分Action层,分发用户请求调用Service层逻辑,分发处理结果数据到jsp,servlet。
php中,view层有模板来充当,模板的核心原理就是替换字符.一个月过去了,这php就和当年c#一样不敢谈了.但是拿过来php的代码我还是能看懂的.

PHPidentifiesauser'ssessionusingsessioncookiesandsessionIDs.1)Whensession_start()iscalled,PHPgeneratesauniquesessionIDstoredinacookienamedPHPSESSIDontheuser'sbrowser.2)ThisIDallowsPHPtoretrievesessiondatafromtheserver.

The security of PHP sessions can be achieved through the following measures: 1. Use session_regenerate_id() to regenerate the session ID when the user logs in or is an important operation. 2. Encrypt the transmission session ID through the HTTPS protocol. 3. Use session_save_path() to specify the secure directory to store session data and set permissions correctly.

PHPsessionfilesarestoredinthedirectoryspecifiedbysession.save_path,typically/tmponUnix-likesystemsorC:\Windows\TemponWindows.Tocustomizethis:1)Usesession_save_path()tosetacustomdirectory,ensuringit'swritable;2)Verifythecustomdirectoryexistsandiswrita

ToretrievedatafromaPHPsession,startthesessionwithsession_start()andaccessvariablesinthe$_SESSIONarray.Forexample:1)Startthesession:session_start().2)Retrievedata:$username=$_SESSION['username'];echo"Welcome,".$username;.Sessionsareserver-si

The steps to build an efficient shopping cart system using sessions include: 1) Understand the definition and function of the session. The session is a server-side storage mechanism used to maintain user status across requests; 2) Implement basic session management, such as adding products to the shopping cart; 3) Expand to advanced usage, supporting product quantity management and deletion; 4) Optimize performance and security, by persisting session data and using secure session identifiers.

The article explains how to create, implement, and use interfaces in PHP, focusing on their benefits for code organization and maintainability.

The article discusses the differences between crypt() and password_hash() in PHP for password hashing, focusing on their implementation, security, and suitability for modern web applications.

Article discusses preventing Cross-Site Scripting (XSS) in PHP through input validation, output encoding, and using tools like OWASP ESAPI and HTML Purifier.


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