PHP 4.0 Bug #6951 Updated: (Too) large integer calculations return bogus values ?

ID: 6951 Updated by: derick Reported By: albert@friendly.net Status: Open Bug Type: Variables related Assigned To: Comments: I just said it was a dup Previous Comments: --------------------------------------------------------------------------- [2000-09-29 20:48:43] derick@php.net Dup (dunno of which one). This bug is analysed, but not fixed yet. --------------------------------------------------------------------------- [2000-09-29 20:43:11] albert@friendly.net [ Linux 2.2.17 on Intel i686 Apache ] <?php // $ip = $mask = $net = 0; settype($ip, "integer"); settype($mask, "integer"); settype($net, "integer"); $ip = 3249287308; // or in my case as a result of some calculations $mask = 4294967288; // or as a result of 256*256*256*256 $net = ($ip & $mask); echo $net; // yields result: -2147483648 /* While the C code that should work alike returns the correct result: -1045679992 (okay gcc warns us: 'decimal constant is so large that it is unsigned') #include <stdio.h> int main() { int ip=3249287308, mask=4294967288, net; net=ip & mask; printf("%in", net); return(0); } */ ?> --------------------------------------------------------------------------- Full Bug description available at: http://bugs.php.net/?id=6951