This looks great, and essentially has everything I had hoped for! My only remaining comment is on the read-only and write-only keywords... this seems really superfluous and strange to me - the syntax (using a hyphenated keyword) and the feature itself, is way off the grid as compared to other languages.
In my opinion, this is a feature that is so exotic, it's likely to never actually be used by anyone. What I dislike the most about this feature, is that it's existence may mandate a "best practice" of declaring read-only properties as read-only. What I mean is, because this feature exists, anytime you're declaring something that is read-only by nature (because a write-accessor makes no logical sense), you would be expected to declare such a property as read-only. In other words, not using the read-only keyword for a property that only has a read-accessor, can only be interpreted in two ways: 1. it's an oversight, or simply bad practice. 2. it's an implied invitation to implement the write-accessor in an extension. Case 1 of course shouldn't happen, while case 2 would be an extremely exotic and far-fetched scenario. I understand the justification for this keyword - but the use-cases are just too rare, and they don't, in my opinion, outweigh the disadvantages. This feature just feel clumsy and out of place to me. I will never use it, and I would strongly prefer not to have to think about it, having to declare read-only and write-only deliberately. For 95% of cases, it's going to be perfectly obvious, both to me and other consumers of the code, why or whether something is read-only or write-only, and the extra guarantee or insulation against error in the marginal 5% of cases do not justify the effort of having to declare it explicitly everywhere. Just my two cents... ---- Subject: [PHP-DEV] [RFC] Propety Accessors v1.1 It's been a while since I posted any updates about this, a few individuals have been asking about it privately and wanting me to get it out the door for PHP 5.5 release. It's come a long way since the last time I posted about it. RFC Document: https://wiki.php.net/rfc/propertygetsetsyntax-as-implemented
