class.implementsDeprecatedClass

Code example

<?php declare(strict_types = 1);

/** @deprecated Use NewService instead */
class OldService
{
}

class Foo implements OldService
{
}

Why is it reported?

This error is reported by the phpstan-deprecation-rules extension.

A class implements a class (not an interface) that has been marked as @deprecated. Deprecated classes are planned for removal in a future version.

Note: triggering this identifier requires a class to implement another class, which PHP itself forbids. PHPStan therefore always also reports a non-ignorable classImplements.class error alongside this one.

How to fix it

Implement a proper interface instead of a deprecated class:

-class Foo implements OldService
+class Foo implements NewServiceInterface
 {
 }