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Date: Mon, 26 Aug 2024 19:06:05 +0200
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Subject: Re: [PHP-DEV] [RFC] Default expression
To: Jordi Boggiano <j.boggiano@seld.be>, Bilge <bilge@scriptfusion.com>,
 "internals@lists.php.net" <internals@lists.php.net>
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From: bobwei9@hotmail.com (Bob Weinand)

Hey Jordi,

On 26.8.2024 13:55:52, Jordi Boggiano wrote:
> One question (sorry if someone already asked, I scanned the thread but 
> it is getting long..):
>
> Taking this example from the RFC:
>
>     function g($p = null) {
>         f($p ?? default);
>     }
>
> Could you go one step further and use default by default but still 
> allow null to be passed in?
>
>     function g($p = default) {
>         f($p);
>     }
>
> I suppose this would mean $p has to hold this "default" value until a 
> function call is reached, at which point it would resolve to whatever 
> the default is. This probably complicates things for very little gain 
> but I had to ask.


First, it would be some sort of spooky action at a distance, likely add 
a new zval type etc.; lots of special handling for a likely minor benefit.

Second, I'd expect that bit of syntax do be useful in inheritance - like 
you implement or override a parent class/interface method specifying a 
default; then you can just use the default of the parent method.


Bob