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What testing and continuous integration practices should a well maintained open source PHP package follow to ensure reliability across different PHP versions and dependency combinations?

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A well maintained package typically includes a comprehensive automated test suite using a tool like PHPUnit, configures continuous integration to automatically run that test suite against multiple supported PHP versions to catch compatibility issues early, uses static analysis tools to catch type related bugs before they reach users, and clearly documents which PHP versions and dependency versions the package officially supports, giving consumers confidence that installing and updating the package will not silently introduce compatibility problems in their own applications.
# GitHub Actions matrix testing multiple PHP versions
strategy:
  matrix:
    php: ['8.1', '8.2', '8.3']
Real-world example A popular open source validation package runs its full test suite automatically against three different supported PHP versions on every single pull request, catching a compatibility issue with an older PHP version before it ever reaches a published release that users would install.

Common follow-ups: How do you configure a continuous integration pipeline to test against multiple PHP versions?;What is the value of static analysis specifically for a widely used shared package compared to a single internal application?

Unit Testing with PHPUnit;Static Analysis (PHPStan & Psalm)
All 7 Package Development & Publishing with Composer questions