This function returns the same int value on a 64 bit mc. like the crc32() function on a 32 bit mc.
<?php
function crcKw($num){
$crc = crc32($num);
if($crc & 0x80000000){
$crc ^= 0xffffffff;
$crc += 1;
$crc = -$crc;
}
return $crc;
}
?>