From: dneilsen at davislangdon dot com dot au Operating system: RedHat Linux 8 & 9 PHP version: 4.3.7 PHP Bug Type: Math related Bug description: Bitwise AND operator does not work on high values
Description: ------------ I have tested this on two separate systems running Redhat 8 and redhat 9 respectively. The Redhat 9 system is running php version 4.3.4 and the redhat 8 is running 4.3.7. php.ini has not been altered and, in the case of the redhat 8 box (php 4.3.7), it was compiled with the following: ./configure --with-mysql --with-apxs=/www/bin/apxs It seems that the bitwise AND operator will not work for values over pow(2,30). In the case of power 31 it returns a negative value and in the case of power 32 and above it returns 0. Thank you for your time :) Regards Daniel Neilsen Reproduce code: --------------- <? for($i=28; $i<34; $i++) { $vala = pow(2,$i); $valb = pow(2,$i); $result = $vala & $valb; echo "$i - $vala & $valb = $result<br>"; } Expected result: ---------------- 28 - 268435456 & 268435456 = 268435456 29 - 536870912 & 536870912 = 536870912 30 - 1073741824 & 1073741824 = 1073741824 31 - 2147483648 & 2147483648 = 2147483648 32 - 4294967296 & 4294967296 = 4294967296 33 - 8589934592 & 8589934592 = 8589934592 Actual result: -------------- 28 - 268435456 & 268435456 = 268435456 29 - 536870912 & 536870912 = 536870912 30 - 1073741824 & 1073741824 = 1073741824 31 - 2147483648 & 2147483648 = -2147483648 32 - 4294967296 & 4294967296 = 0 33 - 8589934592 & 8589934592 = 0 -- Edit bug report at http://bugs.php.net/?id=28691&edit=1 -- Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=28691&r=trysnapshot4 Try a CVS snapshot (php5): http://bugs.php.net/fix.php?id=28691&r=trysnapshot5 Fixed in CVS: http://bugs.php.net/fix.php?id=28691&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=28691&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=28691&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=28691&r=needscript Try newer version: http://bugs.php.net/fix.php?id=28691&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=28691&r=support Expected behavior: http://bugs.php.net/fix.php?id=28691&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=28691&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=28691&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=28691&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=28691&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=28691&r=dst IIS Stability: http://bugs.php.net/fix.php?id=28691&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=28691&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=28691&r=float