Re: [RFC Discuss] Generator Delegation

> Am 02.03.2015 um 01:17 schrieb Niklas Keller <me@kelunik.com>: > > 2015-03-02 0:52 GMT+01:00 Daniel Lowrey <rdlowrey@php.net>: > >> Hi folks, >> >> I'd like to initiate discussion on a proposal to implement generator >> delegation via the following new syntax inside generator functions: >> >> yield * <expr> >> >> The Generator Delegation RFC is available here: >> >> https://wiki.php.net/rfc/generator-delegation >> >> This proposal is conceptually related to (and requires functionality >> proposed by) the forerunning Generator Return Expressions RFC here: >> >> https://wiki.php.net/rfc/generator-return-expressions >> >> >> Thanks for your time, >> >> Daniel >> > > The proposed syntax has an issue: > > <?php > > function a () { > echo yield * 3; > } > > $a = a(); > $a->send(42); > > http://3v4l.org/n1sGb#v550 > > This is currently valid PHP. > > Regards, Niklas Hey, I think we could use "yield from" as operator here. Yes, BC. So, I won't make "from" a keyword, but rather specify an own token for "yield from" (T_YIELD_FROM). That way we have no BC break, except someone tries to yield a constant named "from". I think that's a really minor break … and in case this breaks someones code, he needs to wrap the constant in parenthesis: "yield (from)". We can have nice syntax here with a minimal break, so, then, why not? Thanks, Bob