[PHP-DEV] [Question] Variadic method signature compatibility between 5.6 and 7.0

[Alexander Lisachenko]

Hello, internals!

I have a question about changed behavior in 7.0 for matching signature of
variadic method.

Here is an example of code:

class Foo {
    public static function test($bar = null) {
        var_dump(func_get_args());
    }
}

class Baz extends Foo {
    public static function test(...$args) {
        parent::test(...$args);
    }
}

Baz::test();
Baz::test('hello');

For 5.6 this code works normally, but in 7.0 it produces a warning about
signature: "Warning: Declaration of Baz::test(...$args) should be
compatible with Foo::test($bar = NULL)"

See https://3v4l.org/so6P2

>From userland point of view, these signatures should be compatible, so I
decided to check this behavior, was it intended or not.

Thanks!