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Bruce Weirdan 085e8f6fb2
Forbid implementing some interfaces 
- `Throwable` can only be implemented when classes extend one of
  `Exception` or `Error`
- `UnitEnum` and `BackedEnum` cannot be implemented by user-defined
  classes

Refs vimeo/psalm#7722
2023-02-12 02:48:50 -04:00
..
annotating_code docs: Add entry to utility types mentioning using value-of<> with BackedEnum 2023-02-09 08:53:30 +01:00
contributing Fix typos 2022-08-20 23:29:03 +02:00
manipulating_code Fix typos 2022-08-20 23:29:03 +02:00
running_psalm Forbid implementing some interfaces 2023-02-12 02:48:50 -04:00
security_analysis Add section on limitations 2021-09-04 12:46:15 +01:00
README.md

README.md

About Psalm

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.

Example output

Given a file implode_strings.php:

<?php
$a = ['foo', 'bar'];
echo implode($a, ' ');

> ./vendor/bin/psalm implode_strings.php
ERROR: InvalidArgument - somefile.php:3:14 - Argument 1 of implode expects `string`, `array` provided (see https://psalm.dev/004)

Inspirations

There are two main inspirations for Psalm:

  • Etsy's Phan, which uses nikic's php-ast extension to create an abstract syntax tree
  • Facebook's Hack, a PHP-like language that supports many advanced typing features natively, so docblocks aren't necessary.

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