Hi,
i find it quite confusing myself, here's a use case mixing `&` and `|`.
```php
<?php
namespace App\Foo;
class Bar {
/**
* in this example `Bar` constructor accepts an object that implement
* ( `CacheInterface` and `ResetableInterface` ) or
`ResetableCacheInterface`
*
* should the doc block be formatted this way :
*
* @param
object&CacheInterface&ResetableInterface|ResetableCacheInterface $cache
*
* or maybe like this ?
*
* @param
object&ResetableCacheInterface|ResetableInterface&CacheInterface $cache
*
* or maybe we can use parentheses ? ¯\_(ツ)_/¯
*
* @param object & ( ResetableCacheInterface | ( ResetableInterface &
CacheInterface ) ) $cache
*/
public function __construct($cache) {
// initialize cache property
}
}
```
On Sat, Oct 20, 2018 at 11:53 AM Johannes Schmitt <schmitt...@gmail.com>
wrote:
> Hi there,
>
> generally, I think the addition of `&` is a great idea.
>
> One thing regarding the grammar specifically, right now you would support
> mixing `|` with `&` like `A|B&C`. I'm not sure if mixing would be desirable
> (I don't have use-case for this at this point). Also the grammar currently
> requires `|` to be before `&`- so something like `A&B|C` would not be
> supported - I'm not sure if this is intentional? Maybe it's best to only
> either support `|` or `&`, but not allow to mix them for the moment?
>
> Thanks,
> Johannes
>
> On Fri, Oct 19, 2018 at 2:50 PM Chuck Burgess <demon.g...@gmail.com>
> wrote:
>
>> Hello everyone,
>>
>> There is a new PR [1] from a contributor, asking for an Intersection Type
>> Operator. This appears to simply use `&` akin to how `|` is used for Union
>> Types.
>>
>> Neither Unions nor Intersections are (yet) in the language itself, but
>> `string|null` Union Typing in Tags has been in wide usage for a while now.
>> In looking over RFCs on attempts to get these two Type Operators into the
>> language, it seems likely to me that the Operators chosen will be `|` and
>> `&` if they do ever get in. As such, I'm personally good with the choice
>> of `&` for Intersection Operator for Typing in Tags.
>>
>> Please keep discussion on this request on this ML thread.
>>
>> Chuck Burgess, Editor
>>
>> [1] -- https://github.com/php-fig/fig-standards/pull/1104
>>
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