Question

I have two 32-bit unsigned integers in php (the result of crc32() ) and I want to get the bitwise result of these numbers on a 32 bit version of php.

I have tried many experiments, but evidently there is something I am missing about how php handles these numbers and binary data.

Update:

I am looking for something like this:

$x = crc32("abc");
$bin = sprintf("%b", $x);

$x2    = crc32("abc2");
$bin2 = sprintf("%b", $x2);

$b = $bin | $bin2;


$result = sprintf("%u",$b);

var_dump($result);

That code does not work, but by replacing %b and %u with the right numbers I think it could work

Answer 1

Simply use the the bitwise OR | instead of the logical one, ||:

$x  = crc32("abc");
$x2 = crc32("abc2");
$b = $x | $x2;              // The integer 2142140882
$result = sprintf('%u',$b); // The string "2142140882"

If you want to get a binary string of this result, use pack:

$result_binary = pack('N', $b); // Binary format, "\x7f\xae\x79\d2"