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Date: Sun, 15 Feb 2015 19:48:09 +0000
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Subject: Re: [PHP-DEV] Remove $this from incompatible context
From: rowan.collins@gmail.com (Rowan Collins)

On 15/02/2015 19:32, Marc Bennewitz wrote:
>
> Am 15.02.2015 um 19:09 schrieb Rowan Collins:
>> <snip>
>>
>> The static modifier for methods is part of the method signature and
>> method body isn't.
>> (That's way interfaces doesn't describe method bodies but signatures)
>>
>> The static modifier defines a method as static and therefore defines
>> the
>> method is callable using "::".
>> More specifically, it defines that the method is *only* callable 
>> statically. There is currently no opposite keyword to say that a 
>> method can only be called non-statically, but the absence of a 
>> modifier has up until now meant that either call type is possible. An 
>> interface cannot currently forbid static calls, only the use of $this.
>>
>> Our choice is between keeping that ambiguity, and introducing a new 
>> rule that any method not marked static must never be called 
>> statically (with provisos for technically non-static parent:: etc).
>>
>> Regards,
>
> The problem with the current behavior of "... the absence of a 
> modifier has up until now meant that either call type is possible" is 
> that the library author can't define a method as non static callable 
> and the caller defines if $this can be used.

Agreed. Personally, I'm a great fan of symettry, so part of me would 
prefer to introduce a keyword for when you *can't* call a method 
statically, e.g. "instance function foo() { ... }". But I guess instance 
methods are, or at least "should" be, the majority, so it makes sense to 
reserve the un-annotated form for them.

I worry about how many people will still miss the deprecation warning, 
but then I'm a broken record on the subject of PHP's warning system 
needing an overhaul.

Regards,

-- 
Rowan Collins
[IMSoP]