PHP framework - Which file in thinkPHP defines global predefined constants that can be called in all controllers and models in the future?

That is, I want to define some global constants,

For example, the stand-alone path of a certain file, api interface, etc., in the future I can just call this constant directly in the controller and model class files...

Excuse me, which file should I write the constants in?

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That is, I want to define some global constants,

For example, the stand-alone path of a certain file, api interface, etc., in the future I can just call this constant directly in the controller and model class files...

Excuse me, which file should I write the constants in?

Entry file

Just before Controller is called by ThinkPHP, you can write a const.php to specifically define some constants and import them into the entry file.

index.php

<code>#我喜欢用绝对路径，有时候相对路径嵌套require可能会引起一些错误。
require APP_PATH.'../config/const.php';</code>

It seems that it can be defined in the entry file