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Defining objects as constants

php.internals

Dominic Grostate

4 years ago

This actually works in PHP8, is it intentional?

class Item
{

}

define('ITEM', new Item());

class Sample
{
public const ITEM = ITEM;
}

var_dump(Sample::ITEM);

// object(Test\Item)#3 (0) {
// }

Rowan Collins

4 years ago

On Fri, 19 Aug 2022 at 12:05, Dominic Grostate <codekestrel@googlemail.com>
wrote:

> This actually works in PHP8, is it intentional?
>
> class Item
> {
>
> }
>
> define('ITEM', new Item());
>

More specifically, this works since PHP 8.1, as shown by this handy tool:
https://3v4l.org/UTcfO

I believe it came about as almost a side-effect of
https://wiki.php.net/rfc/new_in_initializers although it also fits well
with enums (which are special objects), since it allows you to do things
like this:

enum DayOfWeek
{
case MONDAY;
case TUESDAY;
case WEDNESDAY;
case THURSDAY;
case FRIDAY;
case SATURDAY;
case SUNDAY;
}
define('SCHEDULED_DAY', DayOfWeek::TUESDAY);

Regards,

--
Rowan Tommins
[IMSoP]