Error Identifier: generics.noParent
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);
/**
* @template T
* @template U of \Exception
*/
class Collection
{
}
/**
* @extends Collection<int, \InvalidArgumentException>
*/
class FooDoesNotExtendAnything
{
}
Why is it reported? #
The class has an @extends PHPDoc tag specifying generic type arguments for Collection, but it does not actually extend any class. The @extends tag is meaningless without a corresponding extends clause in the class declaration.
The same applies to @implements tags on classes that do not implement the referenced interface, and @use tags on classes that do not use the referenced trait.
How to fix it #
Add the missing extends clause:
/**
* @extends Collection<int, \InvalidArgumentException>
*/
-class FooDoesNotExtendAnything
+class FooDoesNotExtendAnything extends Collection
{
}
Or remove the unnecessary @extends tag if the class is not supposed to extend Collection:
-/**
- * @extends Collection<int, \InvalidArgumentException>
- */
class FooDoesNotExtendAnything
{
}
How to ignore this error #
You can use the identifier generics.noParent to ignore this error using a comment:
// @phpstan-ignore generics.noParent
codeThatProducesTheError();You can also use only the identifier key to ignore all errors of the same type in your configuration file in the ignoreErrors parameter:
parameters:
ignoreErrors:
-
identifier: generics.noParent