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Error Identifier: class.extendsTrait
Every error reported by PHPStan has an error identifier. Here’s a list of all error identifiers. In PHPStan Pro you can see the error identifier next to each error and filter errors by their identifiers.
Code example #
<?php declare(strict_types = 1);
trait SomeTrait
{
}
class Foo extends SomeTrait // reported
{
}
Why is it reported? #
A class cannot extend a trait. Traits are designed for horizontal code reuse via the use keyword inside a class body, not for inheritance via extends. Attempting to extend a trait results in a fatal error at runtime.
How to fix it #
Use the trait inside the class body with the use keyword instead of extending it.
-class Foo extends SomeTrait
+class Foo
{
+ use SomeTrait;
}
Non-ignorable error #
This error cannot be ignored using @phpstan-ignore or the ignoreErrors configuration. Non-ignorable errors indicate code that would cause a crash or a fatal error at runtime, or a fundamental problem in the analysed code that must be addressed.
Rules that report this error #
- PHPStan\Rules\Classes\ExistingClassInClassExtendsRule [1]