mirror of
https://github.com/danog/psalm.git
synced 2024-12-15 02:47:02 +01:00
73 lines
3.2 KiB
Markdown
73 lines
3.2 KiB
Markdown
# 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**<br />
|
||
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**<br />
|
||
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**<br />
|
||
Psalm checks that all properties of a given object have values after the constructor is called.
|
||
|
||
- **Taint analysis**<br />
|
||
Psalm can [detect security vulnerabilities](https://psalm.dev/articles/detect-security-vulnerabilities-with-psalm) in your code.
|
||
|
||
- **Language Server**<br />
|
||
Psalm has a Language Server that’s [compatible with a range of different IDEs](https://psalm.dev/docs/running_psalm/language_server/).
|
||
|
||
- **Automatic fixes**<br />
|
||
Psalm can [fix many of the issues it finds automatically](https://psalm.dev/docs/manipulating_code/fixing/).
|
||
|
||
- **Automatic refactoring**<br />
|
||
Psalm can also [perform simple refactors](https://psalm.dev/docs/manipulating_code/refactoring/) from the command line.
|
||
|
||
## Example output
|
||
|
||
Given a file `implode_strings.php`:
|
||
|
||
```php
|
||
<?php
|
||
$a = ['foo', 'bar'];
|
||
echo implode($a, ' ');
|
||
```
|
||
|
||
```bash
|
||
> ./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](https://github.com/etsy/phan), which uses nikic's [php-ast](https://github.com/nikic/php-ast) extension to create an abstract syntax tree
|
||
- Facebook's [Hack](http://hacklang.org/), a PHP-like language that supports many advanced typing features natively, so docblocks aren't necessary.
|
||
|
||
## Index
|
||
|
||
- Running Psalm:
|
||
- [Installation](running_psalm/installation.md)
|
||
- [Configuration](running_psalm/configuration.md)
|
||
- Plugins
|
||
- [Using plugins](running_psalm/plugins/using_plugins.md)
|
||
- [Authoring plugins](running_psalm/plugins/authoring_plugins.md)
|
||
- [How Psalm represents types](running_psalm/plugins/plugins_type_system.md)
|
||
- [Command line usage](running_psalm/command_line_usage.md)
|
||
- [IDE support](running_psalm/language_server.md)
|
||
- Handling errors:
|
||
- [Dealing with code issues](running_psalm/dealing_with_code_issues.md)
|
||
- [Issue Types](running_psalm/issues.md)
|
||
- [Checking non-PHP files](running_psalm/checking_non_php_files.md)
|
||
- Annotating code:
|
||
- [Typing in Psalm](annotating_code/typing_in_psalm.md)
|
||
- [Supported Annotations](annotating_code/supported_annotations.md)
|
||
- [Template Annotations](annotating_code/templated_annotations.md)
|
||
- Manipulating code:
|
||
- [Fixing code](manipulating_code/fixing.md)
|
||
- [Refactoring code](manipulating_code/refactoring.md)
|
||
|