Bug #12435 Updated: Incorrect results from logical AND

ID: 12435 Updated by: derick@php.net Reported By: lovan@lifesci.ucsb.edu Status: Open -Bug Type: Math related +Bug Type: Scripting Engine problem Operating System: Solaris 2.8 PHP Version: 4.0.5 Previous Comments: ------------------------------------------------------------------------ [2001-07-27 14:23:12] lovan@lifesci.ucsb.edu I'm using an integer to store an IP address as a 32-bit value rather than a dotted-quad string and get odd results. Since I'm only using it for shifting bits, I don't think it should matter that PHP is missing an unsigned integer type. $foo = (255 << 24) | (111 << 16) | (241 << 8) | 254; $octet[0] = ($foo & 0xff000000) >> 24; $octet[1] = ($foo & 0x00ff0000) >> 16; $octet[2] = ($foo & 0x0000ff00) >> 8; $octet[3] = ($foo & 0x000000ff); $quad = "$octet[0].$octet[1].$octet[2].$octet[3]"; The expected end result is that I get a dotted-quad string ($quad) that is the same as was used to build $foo. Instead, $octet[0] is miscalculated; it appears as "0" instead of 255. I've tried it for a variety of values and keep getting the same kind of erroneous result. However, if I change the statement to: $octet[0] = (($foo >> 8) & 0x00ff0000) >> 16; I get the expected result. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=12435&edit=1