Hello! I do not know if there is some consensus about "why not use two words as a single keyword" in programming language in general, but I really found a few examples of it, as in SQL with "GROUP BY", for instance.
So I question if it could be used on PHP to expand the keywords repertoire by mixing two words without causes BC. I will use the Attribute syntax-war to exemplify. I really prefer to create a new keyword "attr()" or "attribute()" to make attributes possible. It basically uses the same function-like with arguments to work. But it invariably will cause BC to old codes that use attr or attribute names (eg. "function attr()"). But, if we create a new two-words keyword like "using attr()", maybe it will not cause any BC, because "function using attr()" is impossible, but "using attr(X) function attr()" will do. I do not know if I am being high with peanuts, but maybe it could be considered to this discussion and make possible new features on PHP without creating strange symbols like @@ or #[] that will requires that new users check the documentation about "what it mean", while is very hard to Google symbols (so search will be "what mean double at in PHP" or "what mean hashtag brackets"). Atenciosamente, David Rodrigues
