Bug: Fatal error when trying to define constants based on the environment

[Sunchock]

PHP Version

8.3

CodeIgniter4 Version

4.5.7

CodeIgniter4 Installation Method

Composer (using codeigniter4/appstarter)

Which operating systems have you tested for this bug?

Windows

Which server did you use?

apache

Database

No response

What happened?

I would like to define some constants based on my environment but this give me a Fatal error because 'ENVIRONMENT' is not defined.

Constants are loaded before the environment as you can see in Boot.php L131-132

CodeIgniter4/system/Boot.php

Lines 128 to 136 in dd08f95

	public static function preload(Paths $paths): void
	{
	static::definePathConstants($paths);
	static::loadConstants();
	static::defineEnvironment();
	static::loadEnvironmentBootstrap($paths, false);
	static::loadAutoloader();
	}

Is this an expected design? Can we load constants after environment setup?

Steps to Reproduce

Add condition like if (ENVIRONMENT === 'development') { define('A', expr); } else { define('B', expr); } in Config/Constants.php

Expected Output

I would like my constant to be defined according to the environment

Anything else?

No response

[neznaika0]

Try as if (env('CI_ENVIRONMENT', 'production') === 'development')

[Sunchock]

Try as if (env('CI_ENVIRONMENT', 'production') === 'development')

I got : Fatal error: Call to undefined function env()

[samsonasik]

You can register more constants on per-config files (production.php, development.php, testing.php) under Boot directory that verify based environment used

https://github.com/codeigniter4/CodeIgniter4/tree/develop/app/Config/Boot

[samsonasik]

Closing as answered above #9387 (comment)