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

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