Re: Use of {} with member.

Hi all, On Fri, Jan 30, 2015 at 8:51 AM, Rasmus Lerdorf <rasmus@lerdorf.com> wrote: > On 01/29/2015 01:32 PM, Yasuo Ohgaki wrote: > > Hi all, > > > > I came across with bug #68947 > > https://bugs.php.net/bug.php?id=68947 > > and realized small inconsistency. > > > > http://3v4l.org/ldZKl > > > > $obj->${array[$key]}; // Syntax error > > $obj->{$array[$key]}; // Works > > > > $obj->${key}; // E_NOTICE. Does not work > > $obj->{$key}; // Works > > > > echo "${array[$key]}"; // Works > > echo "{$array[$key]}"; // Works > > > > Of course, script/string parsing aren't the same. Are there technical > > reasons > > why ${value} is not allowed? If there are, we may encourage > > > > echo "{$array[$key]}"; // Works > > > > rather than > > > > echo "${array[$key]}"; // Works > > That all seems expected to me. The original point of that bug report is > the BC break due to the uniform variable rfc. The change makes sense, > but just for the record, I have installed about 10 popular, and a couple > of not-so-popular, PHP apps and tested them on PHP 7 over the past week > and this was the only BC break that affected that set of 10 apps. > > See: > > > https://github.com/rlerdorf/avalon/commit/18847d0fe65381977397271c79e04dde72ef86f8 > > It is listed as a bullet point in a sea of other bullet points in the > UPGRADING file: > > . Indirect variable, property and method references are now > interpreted with left-to-right semantics. See details in: > > > > https://wiki.php.net/rfc/uniform_variable_syntax#semantic_differences_in_existing_syntax > > > But we probably need a section devoted to BC breaks that includes some > real-world code examples. I agree. Since ${var} works in quoted string just like shells, there may be confusion. Extending http://php.net/manual/en/language.variables.basics.php or adding new section might be good. I haven't checked variable variable fully. There may be misbehavior http://3v4l.org/vmKvi Apparently, HHVM have missed to support multiple variable variable reference. Heads up HHVM folks! Regards, -- Yasuo Ohgaki yohgaki@ohgaki.net