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Subject: Re: [PHP-DEV] [RFC] Path to Saner Increment/Decrement operators
From: mark@demon-angel.eu (Mark Baker)

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On 18/01/2023 21:25, G. P. B. wrote:
>> I would like to start the discussion on the Path to Saner
>> Increment/Decrement operators RFC:
>> https://wiki.php.net/rfc/saner-inc-dec-operators
>>
>> The goal of this RFC is to reduce language complexity by making $v++
>> behave like $v += 1 and $v-- behave like $v -= 1;
> If that is the goal, then I would agree with this RFC.
>
> However, changing the PERL string increment feature does not IMO fit
> into that goal, and it also a useful*feature*. On that base I would
> vote against this. And I suspect many others would as well.

However, the ++ and -- are the "Increment" and "Decrement" operators, 
not the Add1 and Subtract1 operators; while they behave in that way when 
used with variables containing numeric values, they are special 
operators and not simply a syntactic sugar for +=1 and -=1. As long as 
their behaviour is consistent, and definition of what "Increment" and 
"Decrement" mean is clearly defined for different datatypes, then I feel 
that the PERL-style alpha string increment has enough valid use cases to 
justify itself.


We might also discuss consistency of datatype changes when these 
operators are used.

$a = PHP_INT_MAX;

++$a;

or

$a = '10';

++$a;

both change the datatype of $a; which isn't documented behaviour either.


-- 
Mark Baker

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