Clarifications on --ignore-platform-req=php+

[piotrekkr]

Hello. I've been looking into composer install/require/update docs and there is an option --ignore-platform-req (without s) that I can use to install packages even tho my php version is greater than max allowed version in package requirements. This is great but I need some more clarifications how it works exactly with other packages that I actually do not need this option.

For example my PHP version is 8.2 and my app requires packages like:

• package-a (older version 1.0 requires php >= 8.0 and php < 8.3, new version 2.0 requires php >= 8.3)
• package-b (old archived package that requires php >= 8.0, php <= 8.1)
  • package-b-1 (required by package-b, php >= 8.0, php <= 8.3)
  • package-b-2 (required by package-b, php >= 8.0, php <= 8.1)

Normally composer install will try to install from lock file and will fail because of PHP version 8.2. When I add --ignore-platform-req=php+ it should work and install version from lockfile, right?

What bout composer update? Will it fail also because of package-b (and some of its deps) requires older PHP? When I add --ignore-platform-req=php+ it should work right? But then will it also install package-a with latest version 2.0 that requires php >= 8.3?

Same question as above will also be for composer require and --ignore-platform-req=php+. Will composer require package-a --ignore-platform-req=php+ try to install latest version of package-a by default or more like latest that matches current PHP version? In case of package-a it would be 1.0 instead of 2.0 (because PHP 8.2).

Thanks.

[Seldaek]

What bout composer update? Will it fail also because of package-b (and some of its deps) requires older PHP? When I add --ignore-platform-req=php+ it should work right? But then will it also install package-a with latest version 2.0 that requires php >= 8.3?

No if you run with php 8.2 it will not install something requiring 8.3.

I think it'll work as expected mostly here, but sure you might find some weird case where it does something wrong as it suppresses some part of the constraints that's normal really.