vimeo/psalm
Psalm is a powerful PHP static analysis tool that finds type errors and bugs before runtime. Install via Composer, configure for your codebase, and run it locally or try the live demo at psalm.dev. Docs and integrations available for teams and CI.
Emitted when a public or protected class property has a different type to the matching property in the parent class.
<?php
class A {
public string $foo = 'hello';
}
class B extends A {
public ?string $foo;
}
For typed properties, this can cause a compile error.
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