Psalm is a static analysis tool that attempts to dig into your program and find as many type-related bugs as possible.
It has a few features that go further than other similar tools:
- Mixed type warnings – if Psalm cannot infer a type for an expression then it uses a mixed placeholder type. mixed types can sometimes mask bugs, so keeping track of them helps you avoid a number of common pitfalls.
- Intelligent logic checks – Psalm keeps track of logical assertions made about your code, so if ($a && $a) {} and if ($a && !$a) {} are both treated as issues. Psalm also keeps track of logical assertions made in prior code paths, preventing issues like if ($a) {} elseif ($a) {}.
- Property initialisation checks – Psalm checks that all properties of a given object have values after the constructor is called.
- Taint analysis – Psalm can detect security vulnerabilities in your code.
- Language Server – Psalm has a Language Server that’s compatible with a range of different IDEs.
- Automatic fixes – Psalm can fix many of the issues it finds automatically.
- Automatic refactoring – Psalm can also perform simple refactors from the command line.
This is free and open source software.
Website: github.com/vimeo/psalm
Support:
Developer: Vimeo
License: MIT License
Psalm is written in PHP. Learn PHP with our recommended free books and free tutorials.
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