Example of usage of NamespaceVisbility

NamespaceVisibilityExample.php

<?php

namespace Foo {

  class Telephone 
  {
    #[NamespaceVisibility]
    public function ring(): void
    {
    }
  }

  class Ringer
  {
    public function ring(Telephone $telephone): Person
    {
      $telephone->ring(); // ✅ OK calling Telephone::ring() from same namespace
    }
  }
}

namespace Foo\SubNamespace {

  use Foo\Telephone;
  
  class SubNamespaceRinger
  {
    public function ring(Telephone $telephone): Person
    {
      $telephone->ring(); // ✅ OK calling Telephone::ring() from sub namespace
    }
  }
}


namespace Bar {

  use Foo\Telephone;
  
  class DifferentNamespaceRinger
  {
    public function ring(Telephone $telephone): Person
    {
      $telephone->ring(); // ❌ ERROR calling Telephone::ring() from different namespace
    }
  }
}