Version conflict with psr/cache v3

[mikemand]

Q	A
Bug report?	yes
Feature request?	no
Library version	2.0.1

Trying to install PHP Insights into a project that already has psr/cache installed at v3 causes Composer to complain. It appears that symfony/cache, which this package relies on, locks psr/cache to ^1.0|^2.0. It looks like I already have doctrine/annotations:^1.13.1 installed in my project (which doesn't limit which version of psr/cache to use), which is in turn required by PHP-CS-Fixer, and (oddly) symfony/routing.

Maybe this is an issue for symfony/cache instead, but I figure this would be a good place to start.

A very simple fix for anyone else that has this problem but still wants to use PHP Insights: composer require --dev --with-all-dependencies nunomaduro/phpinsights - which should automatically downgrade psr/cache to v2 for you. If that doesn't work, simply require psr/cache:^2.0 and then install this package.

[tuarrep]

On my side psr/cache is a dependency required by php-cs-fixer (through doctrine/annotations) too.

I've installed nunomaduro/phpinsight with --with-all-dependencies flag and my php-cs-fixed still works.

[LocalHeroPro]

Update psr/simple-cache to v3 from v1 (2017 year)

$ composer require psr/simple-cache
Using version ^3.0 for psr/simple-cache
./composer.json has been updated
Running composer update psr/simple-cache
Loading composer repositories with package information
Updating dependencies
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Root composer.json requires nunomaduro/phpinsights ^2.1 -> satisfiable by nunomaduro/phpinsights[v2.1.0].
    - nunomaduro/phpinsights v2.1.0 requires psr/simple-cache ^1.0 -> found psr/simple-cache[1.0.0, 1.0.1] but it conflicts with your root composer.json require (^3.0).


Installation failed, reverting ./composer.json to its original content.

or

$ composer outdated
Color legend:
- patch or minor release available - update recommended
- major release available - update possible
psr/simple-cache 1.0.1 3.0.0 Common interfaces for simple caching

[JustSteveKing]

It sounds like circular dependencies are causing an issue. One of the upcoming tasks is to assess dependencies and see how we can handle these - so closing for now for further investigation.

[f-lombardo]

It seems I'm exeperiencing the opposite problem. I use psr/simple-cache v 2.0 and I'm getting this error:

Fatal error: Uncaught LogicException: psr/simple-cache 3.0+ is not compatible with this version of symfony/cache. Please upgrade symfony/cache to 6.0+ or downgrade psr/simple-cache to 1.x or 2.x. in /var/www/symfony/vendor/symfony/cache/Psr16Cache.php:23