Backend DevelopmentPHP TutorialPHP study notes (1) Environment configuration and code debugging_PHP tutorialPHP study notes (1) Environment configuration and code debugging_PHP tutorial
一配置PHP环境
1、了解什么是PHP
PHP（“PHP: Hypertext Preprocessor”，超文本预处理器的字母缩写）
PHP，是英文超级文本预处理语言Hypertext Preprocessor的缩写。PHP 是一种 HTML 内嵌式的语言，是一种在服务器端执行的嵌入HTML文档的脚本语言，语言的风格有类似于C语言，被广泛的运用
2、PHP的背景和优势
PHP的发展背景
1）、1994年由Rasmus Lerdorf创建，开始是一个简单的Perl语言编写的程序，用统计他自己的网站的访问。
后来用C语言重新编写包括可以访问数据库。
2）、1995年 Lerdorf发布PHP/FI 1.0版本和2.0版本，并加入对mySQL的支持，从此建立了PHP在动态网页开发上的地位。
3）、1996年低，有15000个网站使用PHP/FI
4）、1997年中，有超过五万个网站是用PHP/FI开发。开发小组加入了 Zeev Suraski 及 Andi Gutmans 同年PHP3发布。
5）、200年PHP4.0问世，增加了许多新的特性。
6）、在2000年5月22日，以Zend Engine 1.0为基础的PHP 4正式释出，2004年7月13日则释出了PHP 5，PHP 5则使用了第二 代的Zend Engine[5]。PHP包含了许多新特色，像是强化的面向对象功能、引入PDO（PHP Data Objects，一个存取数据
库的延伸函数库）、以及许多效能上的增强。
7）、2008年PHP 5成为了PHP唯一的有在开发的PHP版本。将来的PHP 5.3将会加入Late static binding和一些其他的功能强
化。
优势在那里
1）、开放开源的： 开放源代码。
2）、PHP是免费的： 和其它技术相比，PHP本身免费。
3）、php的快捷性：
程序开发快，运行快，技术本身学习快。嵌入HTML：因为 PHP可以嵌入HTML语言，它相对于其他语言，编辑简单，实用性强，更适合初学者。
4）、跨平台性强：
由于PHP是运行在服务器端的脚本,可以运行在UNIX、LINUX、WINDOWS下。
5）、效率高：
PHP消耗相当少的系统资源。
6）、图像处理：
用PHP动态创建图像
7）、面向对象：
在php4,php5 中，面向对象方面都有了很大的改进，现在php完全可以用来开发大型商业程序。
8）、专业专注；
PHP supports mainly scripting languages, both of which are C-like languages.
Technical Application of PHP
1), pseudo-static and static page generation.
2), process cache and database cache.
3), very good support for W3C standards (DIV+CCS)
4), can carry a large load.
5), distributed
6), support MVC model
7), Ajax framework integration (Jquery framework integration)
8), object-oriented programming support
2. Configure PHP debugging environment
1), Install WAMP
The so-called WAMP refers to the PHP web server environment built by installing the Apache web server (A), MySQL database (M) and PHP script engine (P) under the Windows system (W). Of course, in the LAMP environment, It is better than the WAMP environment, but due to the ease of use of Windows, when we do early development or test some CMS, it is even more convenient and practical to use the WAMP environment. WAMP is these individual pieces of software that together form a powerful web application platform.
Download the latest WAMP helper Wamp5 http://9.scdx1.crsky.com/200711/WAMP5-v1.7.4.rar
2), development tool Zend Studio
Recommended Zend Studio, this is not a free version. Zend Studio is a PHP integrated development environment with powerful professional editing tools and debugging tools. It supports PHP syntax highlighting, syntax auto-filling, bookmarking, syntax auto-indentation and code copying. It has a powerful built-in PHP code debugging tool supports both local and remote debugging modes, and supports a variety of advanced debugging functions.
Zend Studio 8.0.1 official version official download address (excluding IBM i edition download)
- Windows version: http://downloads.zend.com/..ZendStudio-8.0.1.msi
- linux version (32-bit): http://downloads.zend…./ZendStudio-8.0.1-x86.tar.gz
- linux version (64-bit): http://downloads.zend….ZendStudio-8.0.1-x86_64.tar.gz
- DMG installation format for Mac_OS_X: http://downloads.zend….ZendStudio-8.0.1.dmg
(Study notes, superficial understanding. For study reference only, please forgive me if it is insufficient)
How can you protect against Cross-Site Scripting (XSS) attacks related to sessions?Apr 23, 2025 am 12:16 AMTo protect the application from session-related XSS attacks, the following measures are required: 1. Set the HttpOnly and Secure flags to protect the session cookies. 2. Export codes for all user inputs. 3. Implement content security policy (CSP) to limit script sources. Through these policies, session-related XSS attacks can be effectively protected and user data can be ensured.
How can you optimize PHP session performance?Apr 23, 2025 am 12:13 AMMethods to optimize PHP session performance include: 1. Delay session start, 2. Use database to store sessions, 3. Compress session data, 4. Manage session life cycle, and 5. Implement session sharing. These strategies can significantly improve the efficiency of applications in high concurrency environments.
What is the session.gc_maxlifetime configuration setting?Apr 23, 2025 am 12:10 AMThesession.gc_maxlifetimesettinginPHPdeterminesthelifespanofsessiondata,setinseconds.1)It'sconfiguredinphp.iniorviaini_set().2)Abalanceisneededtoavoidperformanceissuesandunexpectedlogouts.3)PHP'sgarbagecollectionisprobabilistic,influencedbygc_probabi
How do you configure the session name in PHP?Apr 23, 2025 am 12:08 AMIn PHP, you can use the session_name() function to configure the session name. The specific steps are as follows: 1. Use the session_name() function to set the session name, such as session_name("my_session"). 2. After setting the session name, call session_start() to start the session. Configuring session names can avoid session data conflicts between multiple applications and enhance security, but pay attention to the uniqueness, security, length and setting timing of session names.
How often should you regenerate session IDs?Apr 23, 2025 am 12:03 AMThe session ID should be regenerated regularly at login, before sensitive operations, and every 30 minutes. 1. Regenerate the session ID when logging in to prevent session fixed attacks. 2. Regenerate before sensitive operations to improve safety. 3. Regular regeneration reduces long-term utilization risks, but the user experience needs to be weighed.
How do you set the session cookie parameters in PHP?Apr 22, 2025 pm 05:33 PMSetting session cookie parameters in PHP can be achieved through the session_set_cookie_params() function. 1) Use this function to set parameters, such as expiration time, path, domain name, security flag, etc.; 2) Call session_start() to make the parameters take effect; 3) Dynamically adjust parameters according to needs, such as user login status; 4) Pay attention to setting secure and httponly flags to improve security.
What is the main purpose of using sessions in PHP?Apr 22, 2025 pm 05:25 PMThe main purpose of using sessions in PHP is to maintain the status of the user between different pages. 1) The session is started through the session_start() function, creating a unique session ID and storing it in the user cookie. 2) Session data is saved on the server, allowing data to be passed between different requests, such as login status and shopping cart content.
How can you share sessions across subdomains?Apr 22, 2025 pm 05:21 PMHow to share a session between subdomains? Implemented by setting session cookies for common domain names. 1. Set the domain of the session cookie to .example.com on the server side. 2. Choose the appropriate session storage method, such as memory, database or distributed cache. 3. Pass the session ID through cookies, and the server retrieves and updates the session data based on the ID.
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