Re: 23 nothing is so as it seems, but why

Sorry Jani, i mean a reference (alias) :) -- Marco 2006/1/19, Jani Taskinen <sniper@iki.fi>: > > > For the 2nd time: references ARE NOT POINTERS! :-p > > --Jani > > > On Thu, 19 Jan 2006, Marco Kaiser wrote: > > > Hmm yes i know this, > > but its very interesting for me to see how php internaly handles ++$a > with a > > pointer. > > Now i understand it :) > > > > -- Marco > > > > 2006/1/19, Marcus Boerger <helly@php.net>: > >> > >> Hello Marco, > >> > >> though Hartmut is perfectly correct in his statement here's what > >> happens: > >> > >> $a = 10; // 10 > >> ++$a // 11 > >> $a + $a // 22 > >> $a++ // 23 > >> > >> Thursday, January 19, 2006, 5:41:17 PM, you wrote: > >> > >>> Today during a session i had a strange "magic" feature found in php. > >> > >>> <?php > >>> $a = 10; > >>> echo ++$a + $a++; > >> ?>> > >> > >> just to verfiy echo $a after your echo line, it will show 12 > >> > >>> this works perfect as expected. it returns 22. > >>> but if i assign $a as a ref. to another variable it will be return 23.. > >> > >>> <? > >>> $a = 10; > >>> $b = &$a; > >>> echo ++$a + $a++; > >> ?>> > >> > >>> this will gave me to 23 > >>> (used the $b to the pre post stuff) > >> > >>> <? > >>> $a = 10; > >>> $b = &$a; > >>> echo ++$b + $b++; > >> ?>> > >> > >>> this just happens if i have a ref. count to my var. WHY? :) > >> > >>> http://en.wikipedia.org/wiki/23_%28film%29 > >> > >>> -- > >>> Marco Kaiser > >> > >> > >> > >> Best regards, > >> Marcus > >> > >> > > > > > > -- > > Marco Kaiser > > > > -- > Give me your money at @ > <http://pecl.php.net/wishlist.php/sniper> > Donating money may make me happier and friendlier for a limited period! > Death to all 4 letter abbreviations starting with P! > -- Marco Kaiser