Re: Support negative indexes for arrays and strings

On 1 Sep, 2012, at 1:11 AM, Rasmus Schultz <rasmus@mindplay.dk> wrote: > Yes, typo! sorry. > > $array = array(1001, 1002, 1003, 1004); > $number = $array[-1]; // => 1004 > $array[-1] = 1005; > $number = $array[-1]; // => ???? > > Looking at the resulting code, I would like to point out also that > it's extremely misleading... because $array[-1] references two > completely different elements depending on whether you're reading or > writing the value... unless $array[-1] = 1005 would actually overwrite > the last element in the array - in which case it gets even more > dangerous, as well as breaking backwards compatibility... That might actually be something I could use :) But the fun for me begins here: $numbers = array(); $numbers[-1] = 5; $numbers[] = 6; What would have happened to the keys? Normally [] is equivalent to [count($numbers)]. Perhaps this is why JS treats negative indices as properties instead :) > > > On Fri, Aug 31, 2012 at 9:24 AM, Ferenc Kovacs <tyra3l@gmail.com> wrote: >> >> >> On Fri, Aug 31, 2012 at 3:14 PM, Rasmus Schultz <rasmus@mindplay.dk> wrote: >>> >>> Having thought about this for a while, I think this is a bad idea - here's >>> why: >>> >>> $array = array(1001, 1002, 1003, 1004); >>> >>> $number = $array[-1]; // => 1004 >>> >>> $number[-1] = 1005; >>> >>> $number = $array[-1]; // => ???? >>> >>> Obviously, the last statement must return 1005, since otherwise that >>> value would be inaccessible. >>> >> >> maybe you wanted to write >> $array[-1] = 1005; >> instead of >> $number[-1] = 1005; >> ? >> >> otherwise I can't see the problem that you are mentioning. >> could you clarify? >> >> -- >> Ferenc Kovács >> @Tyr43l - http://tyrael.hu > > -- > PHP Internals - PHP Runtime Development Mailing List > To unsubscribe, visit: http://www.php.net/unsub.php >