Hi Michał, First of all: +1 to this: very useful for value objects!
A few questions: * can you re-declare a final property in a sub-class, making it therefore non-final? (I have reasons to do that, related with altering states via mappers) * do we want to use `final`, or `immutable` for these properties? `final` seems to just be a confusing term here. * is this feature portable to variables in general? I realize that adding metadata to ZVals has huge performance implications, but it would be interesting to do that for performance improvements further down the line Cheers, Marco Pivetta http://twitter.com/Ocramius http://ocramius.github.com/ On 4 April 2016 at 19:53, Michał Brzuchalski <mic...@brzuchalski.com> wrote: > Hey Internals, > > I'm new here. I've been wondering / working on adding final properties into > PHP lang. > > This work started once I had the time to read the "Core Java for > Impateient" by Cay S. Horstmann > and found it very usefull to have final properties like Java. > > Those properties differ than `const` because they can be set at runtime - > but only once in their lifetime. > Such properties could be very usefull in Singletons, ValueObjects etc. impl > like: > > class Money { > public final $amount; > public final $currency; > public function __constructor($amount, $currency) { > $this->amount = $amount; > $this->currency = $currency; > } > } > > In above example there is even no need for getter because those properties > are immutable through > the final keyword, it means those properties cannot change their references > just like in Java > https://en.wikipedia.org/wiki/Final_(Java) > > I've already started some impl on own fork > https://github.com/php/php-src/compare/master...brzuchal:final-properties > I've got some basics in C programming, don't know yet if I can impl it > complex. > > I was wondering if it is usefull in yours opinion or is it only my > impression. > > I can provide an RFC if it sounds usefull and if I get Wiki karma > > Thanks > -- > Michał Brzuchalski (aka brzuchal) >
