Unfragile

The request names phpstan and phpunit, so the answer centres on PHPStan 1, a static analyser that finds bugs across a codebase without tests, and PHPUnit 2, the industry-leading PHP test automation framework. The package phpstan/phpstan-phpunit is not separately described on the fetched pages, so these two named products are the relevant choices, with PHPStan's own PHPUnit-oriented analysis and PHPUnit providing the testing side.

1
PHPStanphpstan.orgwebsite read, tools not yet checked
Scans a whole PHP codebase statically to find obvious and tricky bugs, including in code paths tests never reach, and can run locally and in CI 1.
Website Docs
+1 community tools built for it
2
PHPUnitphpunit.dewebsite read, tools not yet checked
The industry-leading test automation framework for PHP software, used to write and run the unit tests that PHPStan's PHPUnit support analyses 2.
Website Docs
+1 community tools built for it

Sources

1Find Bugs Without Writing Tests | PHPStanphpstan.org · read 2026-10-29
2PHPUnit: The testing framework for PHPphpunit.de · read 2026-10-29

For agents: the 10 actions behind this answer

· PHPStan website read, tools not yet checked
· PHPUnit: The testing framework for PHP website read, tools not yet checked
PHPUnit is the industry-leading test automation framework for software built using PHP.
data-unit-tests · pydeequ verified and signed
csharp-tunit · csharp-tunit verified and signed
Get best practices for TUnit unit testing, including data-driven tests
unit-testing · Microsoft.Testing.Extensions.VSTestBridge verified and signed
Amazon · AWSSDK - Extensions for NETCore Setup verified and signed
yaml · strictyaml verified and signed
unittest · pytest verified and signed
syntax · Pygments verified and signed
· Playwright website read, tools not yet checked
Web automation and testing for apps, scripts, and AI agents

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