Newsgroups: php.internals
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Xref: news.php.net php.internals:108928
Date: Mon, 09 Mar 2020 21:01:52 +0000
To: Benjamin Eberlei <kontakt@beberlei.de>
Cc: PHP Internals <internals@lists.php.net>
Reply-To: Saif Eddin Gmati <azjezz@protonmail.com>
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Subject: Re: [PHP-DEV] [RFC] Attributes v2
From: azjezz@protonmail.com (Saif Eddin Gmati)

Really excited to see the discussion about this feature being brought up ag=
ain, thanks for working on this :)

One thing I would suggest is to add a base interface `Attribute` and multip=
le sub-interfaces such as `ClassAttribute`, `MethodAttribute`, and `Propert=
yAttribute` just like hack lang ( https://docs.hhvm.com/search?term=3DHH%20=
Attribute )

This allows one to declare attributes that can only be used with classes ( =
e.g `ORM\Entity` ), so PHP and check against them at runtime and throws an =
error when an attribute is used in the wrong place.

```php

namespace ORM {

  class Entity implements \ClassAttribute { ... }

}

namespace Foo {
  use ORM;

  <<ORM\Entity(...)>>  // <-- Error
  function bar(): void {}
}
```


I also question whether the following syntax would be supported:

```php
<<ORM\Entity(...), ORM\Table(...)>>
class Use {...}
```



I'm really looking forward to this since it can help bring more features in=
to PHP such as :

- https://docs.hhvm.com/hack/attributes/predefined-attributes#__entrypoint
- https://docs.hhvm.com/hack/attributes/predefined-attributes#__memoize
- https://docs.hhvm.com/hack/attributes/predefined-attributes#__sealed


Regards.