Resolving PHPStan Error Discrepancies Between Local and CI Environments

When PHPStan reports different errors on your local machine compared to your continuous integration (CI) environment, it can be challenging to resolve. In a detailed blog post on PHPStan, the key steps to address this issue are outlined. The first step is ensuring that both environments are analyzing the same Git commit, which can be verified by checking the commit hash and confirming no uncommitted changes exist locally. It's also crucial to run the same PHP version in both environments, as version discrepancies can lead to different analysis results. To maintain consistency, PHPStan should be installed via Composer within your project dependencies, ensuring all environments use the same version. Additionally, committing your composer.lock file to your Git repository and using composer install it instead of composer update in CI helps lock dependencies to the same versions. PHPStan's diagnose command, introduced in version 1.11.8, provides detailed information to compare configurations between environments, helping to pinpoint discrepancies. These steps ensure consistency in PHPStan analysis across local and CI environments.