On 20 August 2010 17:41, Peter Lind <peter.e.l...@gmail.com> wrote: > On 20 August 2010 17:10, Andy McKenzie <amckenz...@gmail.com> wrote: >> Hey everyone, >> >> I'm really not sure what's going on here: basically, the bitwise >> NOT operator seems to simply not work. Here's an example of what I >> see. >> >> ============Script============ >> >> $ cat bintest2.php >> >> <?php >> >> $bin = 2; >> $notbin = ~$bin; >> >> echo "Bin: " . decbin($bin) . " !bin: " . decbin($notbin) . "\n"; >> echo "Bin: $bin !bin: $notbin\n"; >> >> >> ?> >> ============================= >> >> >> ============Output============ >> >> $ php bintest2.php >> Bin: 10 !bin: 11111111111111111111111111111101 >> Bin: 2 !bin: -3 >> >> ============================= >> >> >> Obviously that's not the expected response. I expect to get something >> more like this: >> >> Bin: 10 !bin: 01 >> Bin: 2 !bin: 1 >> >> >> Can anyone shed some light on this for me? The server is running an >> old version of OpenSUSE, and php --version returns: >> > > You probably need to read up on computer architechture and CS theory - > the ~ operator works fine, your understanding does not. What you're > looking at is the following: > > $bin = 2 = 00000000000000000000000000000010 (64 bit number)
32-bit number, as Colin pointed out. Peter -- <hype> WWW: http://plphp.dk / http://plind.dk LinkedIn: http://www.linkedin.com/in/plind BeWelcome/Couchsurfing: Fake51 Twitter: http://twitter.com/kafe15 </hype> -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
