class_core.php 模块功能白皮书
source/class/class_core.php 是 Discuz! 的通用初始化模块程序,其几乎被所有的外部代码所引用,在您开始插件设计之前,可以先对该模块的大致功能做一定的了解。class_core.php 主要完成了以下任务:
- 对不同 PHP 及操作系统环境做了判断和兼容性处理,使得 Discuz! 可以运行于各种不同配置的服务器环境下。
- 初始化常量 IN_DISCUZ 为 TRUE,用于 include 或 require 后续程序的判断,避免其他程序被非法引用。
- 读取社区程序所在绝对路径,存放于常量 DISCUZ_ROOT 中。
- 加载所需的基本函数库 source/function/function_core.php。
- 通过 config/config_global.php 中提供的数据库账号信息,建立数据库连接。Discuz! 支持数据表的前缀,如需获得表的全名,可使用“DB::table('tablename')”方式。
- 判断用户是否登录,如登录标记 $_G['uid'] 为非 0,同时将 $_G['username'](加了 addslashes 的用户名,可用于不加修改的插入数据库)、 $_G['member']['username'](原始的用户名,可用于页面显示)、$_G['member']['password'](用户密码的MD5串)等相应用户信息赋值,其他用户信息存放于 $_G['member'],更多信息可通过“getuserprofile()”获取。
- 判断用户管理权限,将管理权限标记 $_G['adminid'] 为 1~3 中间的值。0 代表普通用户;1 代表论坛管理员;2 代表超级版主;3 代表论坛版主。 将用户权限按照其所在的主用户组 ID 标记为 $_G['groupid'],相关权限从该 $_G['groupid'] 所对应的系统缓存中读出,存放于 $_G['group']。
- 预置读入了每个模块的各种设置变量。

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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