DZ Forum core code analysis plan - core file common.inc.php_PHP tutorial

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This file is the core brain-level file of DZ.
In actual analysis, there is not much content. Most of them are conditional judgments and command statements. Introducing a large number of files.
Understanding this file can better understand how the entire DZ forum operates. This file is introduced on almost every page.
To be honest, the farther back I look, the bigger my head gets. . . A large number of multi-layer 3D conditional judgments. . Hehe, I don’t know if I’m right, it’s this type. Some are inlaid with as many as 4 layers. Feeling dizzy. But it's mostly done.
The most worth learning about this document is its emphasis on and handling of security. .
Upload the file with the comments first
The other files will be sorted and sent up later. But this is enough to explain a lot of things.
I hope you experts can point out any mistakes in writing.

Originally, I planned to finish this part and then post it in an update. but. . . In the afternoon, I was confused when analyzing the code of DZ's caching mechanism. Just go get SVN. SVN downloads are now available.
Why is this floor updated but not downloaded? It's because this part hasn't been completed yet. There are 3 files analyzed today in SVN for reference

文件名	文件位置	文件作用	分析开始时间	分析结束时间
discuz_version.php	Root Directory	Copyright Document	October 3, 2008 18:03:43	October 3, 2008 18:03:43
db_mysql.class.php	include	Database link	October 3, 2008 18:06:25	October 4, 2008 10:12:28
install.func.php	install	Function file of the installer	October 4, 2008 10:36:44	October 4, 2008 14:02:12
install.config.php	install	Initial configuration of database	October 4, 2008 14:22:19	October 4, 2008 14:22:21
global.func.php	include	Global function definition	October 5, 2008 15:05:13	October 6, 2008 16:40:45
messages.lang.php	templatesdefault	Array file to store prompt information
seccode.lang.php	templatesdefault	Store random Chinese string file
pms.lang.php	templatesdefault	SMS language file
security.inc.php	include	Provide security protection according to the security level	October 8, 2008 11:01:46	October 8, 2008 12:02:05
cache_settings.php	/forumdata/cache/	Storage cached setting variables
serverbusy.html	include	Server Busy Page File
counter.inc.php	include	Platform counter file	October 8, 2008 12:07:21	October 8, 2008 13:27:26
cache.func.php	include	Cache related functions	October 8, 2008 13:34:19

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