Hi Sara, 2013/7/20 Sara Golemon <poll...@php.net> > > What's undefined isn't the relationship between preinc/postinc and add. What's undefined is the use of multiple preinc/postinc operators within a single expression (preincrements in particular). Our parser grammer, as it currently stands, does have a predictable order, but that is a side-effect of implementation. The language's definition of order of resolution of multiple preinc/postinc elements within a single ticked statement is that they are undefined. And *that* is what made your *particular* change to the documentation incorrect. > > If you'd like to define behavior for: echo ++$a + 1; then that's a different matter. Defining the behavior of ++$a + $a++, however is inviting misunderstanding*. > > What was inappropriate, was asking for comment, receiving comment which cited an issue, then committing without discussing that issue first. > > -Sara > > * Even if, technically, either order of evaluation will result in the same answer for this contrived expression. ++$a * $a++ is a more obviously ambiguous answer for a language which explicitly does not define an order of resolution.
++/-- can be problematic for compilers when it is applied to in the same arithmetic operator. I can agree with this. It depends on compiler implementation. I understand you suggesting users are suggested not to use -- ++ for the same vars on the same arithmetic operations. Is this correct? Regards, -- Yasuo Ohgaki yohg...@ohgaki.net
