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You might also look into exakat and phpstan. I can speak to the quality of exakat (my preferred static analyzer), where phpstan comes in as a close second.

This one also looks decent, and will be evaluating it for use in my day job.

This one looks more like a polished wrapper around phpstan and several other tools: https://github.com/nunomaduro/phpinsights/blob/master/compos...

It doesn't wrap PHPStan

Psalm is great, it's my favourite with phpstan a reasonably close second.

At previous company we used for years Scrutinizer [1] and it helped us maintaining some huge PHP codebase.

It should be free for open source projects

[1] https://scrutinizer-ci.com/