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Date: Sat, 15 Mar 2025 00:36:12 +0100
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Subject: Re: [PHP-DEV] RFC: short and inner classes
To: "Rowan Tommins [IMSoP]" <imsop.php@rwec.co.uk>, internals@lists.php.net
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From: bobwei9@hotmail.com (Bob Weinand)


On 15.3.2025 00:21:32, Rowan Tommins [IMSoP] wrote:
> On 05/03/2025 23:11, Rob Landers wrote:
>>
>> I'd like to introduce my RFC for discussion: 
>> https://wiki.php.net/rfc/short-and-inner-classes
>
>
> As a user, I find the concept of inner classes quite confusing.
>
> However, I was looking at some code earlier and thought an "inner 
> enum" would be useful, to replace various "MODE_FOO" type class 
> constants - but I see those are left to future scope. :(
Yeah, that's quite disappointing. I expected this to simply apply to all 
types of "class" until I saw the explicit exclusion.
>
> I'm aware they exist in a lot of other languages, though, so I thought 
> I'd look around at how the proposed version compares. It seems there's 
> quite a zoo out there...
>
> One common theme I do note is that all four of the pages I found are 
> titled "nested classes" or "nested types"; in some cases, "inner 
> class"/"inner type" has a specific meaning, which I don't think 
> matches the RFC's proposal.
>
>
> C# - 
> https://learn.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-and-structs/nested-types
>
> I think this is most similar to what you're proposing. Interestingly, 
> the nested class defaults to being private, i.e. only usable within 
> the parent class.
The default visibility in c# is private, for everything. The RFC is 
consistent with the default visibility in PHP: public. c# is consistent 
with the default visibility for c#.
> Classes, structs and interfaces can all be nested inside each other.
>
>
> Java - https://docs.oracle.com/javase/tutorial/java/javaOO/nested.html
>
> There are two types of nested class (plus some more related concepts 
> which seem less relevant)
>
> - "Static nested classes" - static in the sense that they act like a 
> static member of the surrounding class; appear to be *only* about 
> namespacing and visibility of the class, with no special access to the 
> surrounding scope
> - "Inner classes" - associated not just with a parent class, but a 
> parent *instance*, so have to be created with the syntax 
> "ParentClassName.new InnerClassName" or "this.new InnerClassName"; are 
> not allowed to have static members
inner (instance) classes in Java are quite a weird beast. I don't think 
it fits PHP paradigm nicely.


Bob