Dependency conflict with psr/simple-cache causing installation failure

[Tarom11]

Summary

The package mrcnpdlk/regon-api version 2.0.0 requires psr/simple-cache ^1 which conflicts with other modern packages that require psr/simple-cache ^2 or ^3, making it impossible to install the package in current PHP projects.

Environment

• PHP Version: 8.1+ (modern environment)
• Composer Version: Latest
• mrcnpdlk/regon-api Version: 2.0.0
• Conflicting packages: mobiledetect/mobiledetectlib ^4.8

Error Message

Your requirements could not be resolved to an installable set of packages.

Problem 1
  - Root composer.json requires mobiledetect/mobiledetectlib ^4.8 -> satisfiable by mobiledetect/mobiledetectlib[4.8.01, ..., 4.8.09].
  - Root composer.json requires mrcnpdlk/regon-api ^2.0 -> satisfiable by mrcnpdlk/regon-api[2.0.0].
  - mobiledetect/mobiledetectlib[4.8.01, ..., 4.8.05] require psr/simple-cache ^3.0 -> satisfiable by psr/simple-cache[3.0.0].
  - mobiledetect/mobiledetectlib[4.8.06, ..., 4.8.07] require psr/simple-cache ^2 || ^3 -> satisfiable by psr/simple-cache[2.0.0, 3.0.0].
  - mobiledetect/mobiledetectlib[4.8.08, ..., 4.8.09] require psr/simple-cache ^3 -> satisfiable by psr/simple-cache[3.0.0].
  - mrcnpdlk/regon-api 2.0.0 requires psr/simple-cache ^1 -> satisfiable by psr/simple-cache[1.0.0, 1.0.1].
  - You can only install one version of a package, so only one of these can be installed: psr/simple-cache[1.0.0, 1.0.1, 2.0.0, 3.0.0].

Steps to Reproduce

1. Create a new PHP project with Composer
2. Add mrcnpdlk/regon-api: "^2.0" to composer.json
3. Add mobiledetect/mobiledetectlib: "^4.8" to composer.json (or any other modern package requiring psr/simple-cache ^2 or ^3)
4. Run composer install or composer update
5. Observe the dependency conflict error

Current composer.json requirements

{
    "require": {
        "mrcnpdlk/regon-api": "^2.0",
        "mobiledetect/mobiledetectlib": "^4.8"
    }
}

Expected Behavior

The package should be installable alongside other modern PHP packages without dependency conflicts.

Proposed Solution

Update the composer.json of mrcnpdlk/regon-api to support newer versions of psr/simple-cache:

{
    "require": {
        "psr/simple-cache": "^1.0 || ^2.0 || ^3.0"
    }
}

This would maintain backward compatibility while allowing the package to work with modern dependencies.

Workarounds

Currently, users need to either:

1. Use composer update --with-all-dependencies -W (may cause other issues)
2. Switch to alternative packages like gusapi/gusapi
3. Remove conflicting packages

Impact

This issue prevents the package from being used in modern PHP applications, limiting its adoption and forcing developers to seek alternatives.

Additional Context

• PSR-16 (Simple Cache) version 1.0 was released in 2017
• Most modern packages have moved to psr/simple-cache ^2.0 or ^3.0
• This conflict is becoming increasingly common as the PHP ecosystem evolves

Thank you for maintaining this package! A fix for this dependency conflict would be greatly appreciated.