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Date: Thu, 12 Aug 2021 21:16:06 +0200
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Subject: readonly properties
From: marc@mabe.berlin (Marc)

Hi,

As 8.1 adds readonly properties I wonder which build-in properties 
should be defined readonly.

Currently I could find build-in readonly properties only on PDO and DOM.


Very incomplete list where readonly properties could make sense:

1. Enum properties:

enum Test:string {
     case TEST = 'test';
}

$case = TEST::TEST;
$refl = (new ReflectionObject($case))->getProperty('value');
var_dump($refl->isReadOnly());  // false
var_dump($refl->isPublic());  // true
$case->value = 'foo'; // Fatal error: Uncaught Error: Enum properties 
are immutable


2. DateInterval->days

$interval = (new DateTime())->diff(new DateTime());
var_dump($interval->days); // 0
$refl = (new ReflectionObject($interval))->getProperty('days');
var_dump($refl->isReadOnly()); // false
var_dump($refl->isPublic()); // true
$interval->days = 2;
var_dump($interval->days);  // 0


3. Exception properties

Exception properties are protected but does it really make sense to be 
able to modify an exception property after initialization?

I know this would be a BC break :(


Thanks for all the excellent work - Can't wait for 8.1 :)

Marc