The one caveat about decrementing "A" and it goes to NULL is that if you increment NULL it goes to 1 so that may be confusing. We could also decrement "A" and it goes to FALSE and FALSE++ is still FALSE
On Thu, Jul 18, 2013 at 1:10 PM, Phil Sturgeon <em...@philsturgeon.co.uk>wrote: > Incrementing "Z" results in "AA", because we're starting again. > Decrementing "A" should probably go to NULL as -A is no good. > > -- > Phil Sturgeon > > On Thursday, July 18, 2013 at 3:08 PM, Martin Amps wrote: > > One hiccup. I imagine maybe the reason we don't support decrementing is > because what would happen if you tried to decrement 'A'. In that case I > would suggest either returning NULL or throwing a notice. > > > It would make sense to make it stay as ‘A’ like incrementing ‘Z' stays as > ‘Z’. > > I do agree that string manipulation with arithmetic operators needs > work/clarification. > > On Jul 18, 2013, at 7:37 AM, Xinchen Hui <larue...@gmail.com> wrote: > > 在 2013-7-18，22:31，Mateusz Kocielski <s...@digitalsun.pl> 写道： > > It seems logical that if we support increment we should support decrement. > > > My proposal: > > > 1) Support decrementing letters > > - or - > > 2) Throw a notice explaining that decrementing is not supported so > > developers quickly know they can't do that > > > One hiccup. I imagine maybe the reason we don't support decrementing is > > because what would happen if you tried to decrement 'A'. In that case I > > would suggest either returning NULL or throwing a notice. > > > Thanks for the input > > > Chris London > > > Hello, > > Does anybody understand the rules behind the string incrementation? What's > the explanation of following behaviour? > > '$x="ZZ";$x++;var_dump($x);' returns string(3) "AAA" > '$x=" ZZ";$x++;var_dump($x);' returns string(3) " AA" > > see http://www.php.net/manual/en/language.operators.increment.php > > thanks > > Regards, > Mateusz Kocielski > > >
