Hi, Hmm.. interesting... "tst1=-2147483648, tst1_eq=-2147483648, tst1_type=integer tst2=2147483648, tst2_eq=-2147483648, tst2_type=double" at me... PHP Version 5.3.3-1ubuntu9.5 (Apache 2.0 - i686) Valentine
On Tue, May 17, 2011 at 5:19 PM, Vitalii Demianets <vi...@nppfactor.kiev.ua>wrote: > Hello, all! > > I've encountered odd behavior of PHP regarding bitwise AND operation when > dealing with 31-st bit, and kindly ask to give me some pointers. > Consider the following snippet: > > $tst1 = (1 << 31); > $tst2 = 0x80000000; > $tst1_eq = $tst1 & 0x80000000; > $tst2_eq = $tst2 & 0x80000000; > print "tst1=$tst1, tst1_eq=$tst1_eq, tst1_type=".gettype($tst1)."\n"; > print "tst2=$tst2, tst2_eq=$tst2_eq, tst2_type=".gettype($tst2)."\n"; > > The output is: > > tst1=-2147483648, tst1_eq=0, tst1_type=integer > tst2=2147483647, tst2_eq=2147483647, tst2_type=integer > > And I totally can not understand, why in the hell tst1_eq=0 ? > (BTW I'm using PHP 5.2.14 on 32-bit CPU, if that matters) > > Sorry if this is well-known feature and have discussed before. In such a > case > please point me to the URL of the discussion. > > -- > Vitalii Demianets > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php > >
