ReflectionParameter::__toString should return FQCN symbols

[nicolas-grekas]

Description

The following code:

namespace App;

class Foo
{
    public function baz(string $arg = new Foo() . Foo::BAR)
    {
    }
}

$r = new \ReflectionMethod(Foo::class, 'baz');

echo $r->getParameters()[0];

Resulted in this output:

Parameter #0 [ <optional> string $arg = new \App\Foo() . App\Foo::BAR ]

But I expected this output instead:

Parameter #0 [ <optional> string $arg = new \App\Foo() . \App\Foo::BAR ]

Originally reported at doctrine/common#983

PHP Version

8.1+

Operating System

No response

[Girgias]

This also applies to PHP 8.0: https://3v4l.org/fVZOh

[iluuu1994]

Worth noting the new case only works by chance because the fetch type overrides the ZEND_NAME_NOT_FQ flag:
https://3v4l.org/JXNPW

namespace App;

class Foo {
    public function bar(string $p = new parent)
    {
    }
}

$r = new \ReflectionMethod(Foo::class, 'bar');
echo $r->getParameters()[0];

Parameter #0 [ string $p = new namespace\parent() ]