Re: Closures and $this

2009/12/15 Christian Seiler <chris_se@gmx.net>: > Hello again, > >> Discuss away! > > I'm a little disappointed by the non-outcome of this debate. Very few > people have responded and most of them seem to agree proposal (A) should > be implemented, perhaps with the additional bind/bindTo as in my > proposal and perhaps not. > > The problem here is: (A) was exactly the thing that was implemented and > that people started to have a problem with as soon as the first or > second beta of PHP 5.3 was released. And because the feedback came in so > late, Lukas & Johannes decided to remove $this support from closures for > PHP 5.3 in order to be able to decide that later on. > > So basically we're at the same point where we were a little more year > ago: There's an RFC for this (the semantics of $this support were > discussed in the original closures RFC!) and the people who read it on > internals@ support it. However, I predict that if we implement exactly > the semantics that the RFC proposes, we will get into the same > discussion we had with PHP 5.3 just before the release of PHP 6... (or > 5.4 should there be one). > > So: What now? > > Regards, > Christian > > -- > PHP Internals - PHP Runtime Development Mailing List > To unsubscribe, visit: http://www.php.net/unsub.php > > How much of a use case is binding $this to closures (personally, I think this is quite a common usage, but I've been using JavaScript so maybe I've got the wrong head on). But, if there are significant technical/internal issues with regard to binding $this to closures, what about (and I'm expecting the usual shoot down here as I obviously know squat) NOT binding closures at all (option 0). Instead get traits working. A trait (as I understand things from the rfc) from a userland perspective seems to offer some very similar features of bound closures. Binding a closure to an object, to all intents and purposes extends the object with a new callable method. Traits do that too. Completely differently - agreed - but a class with a trait has a new method. An object with a bound closure has a new method (ish). I know there are differences, but because it had been previously decided to NOT include bound closures, changing that (surely only at 6 or at a BIG push 5.4 if and when) would have to be considered so not to break BC (though I can't really see how allowing $this to be bound would break BC as you can't bind $this at the moment). At this late stage, is this a realistic option? If this _IS_ an option then I'd vote for this. I'd much rather have traits than bound closures. Regards, Richard. -- ----- Richard Quadling "Standing on the shoulders of some very clever giants!" EE : http://www.experts-exchange.com/M_248814.html Zend Certified Engineer : http://zend.com/zce.php?c=ZEND002498&r=213474731 ZOPA : http://uk.zopa.com/member/RQuadling