Re: [PHP-DEV] [Concept] Flip relative function lookup order (global, then local)

[Rowan Tommins [IMSoP]]

On 24 August 2024 19:16:13 BST, Stephen Reay <php-li...@koalephant.com> wrote:
>
>> On 25 Aug 2024, at 00:01, Ilija Tovilo <tovilo.il...@gmail.com> wrote::
>> 
>> 1. Flipping lookup order: ~a few dozens of changes
>> 2. Global only: ~3 000 changes
>> 3. Local only: ~139 000 changes

>There's also an impact on internals development/RFC with either (1) or (2): 
>*any* proposed new global function in the standard library now has a BC 
>barrier to pass if it *might* conflict with one defined by anyone in userland, 
>in any namespace. 

Just to correct this point, this is only a problem for option 1. With option 2, 
if the function exists only in a namespace, you have to unambiguously refer to 
that namespaced name (via whatever syntax), and there is no chance of collision 
with a global name in future. For me, that's one of the biggest advantages of 
that option. 

And to repeat myself: I agree that option 3 is the ideal in theory, but in 
practice the short/medium term impact is so big, I'm not convinced it's worth 
it for the long term gain.

Rowan Tommins
[IMSoP]