note 76865 added to function.unpack

If you need to unpack an unsigned long that's larger than php's limit (2^31-1) and don't mind doing a lot of fiddling, an easy solution is to unpack it as two shorts. For example <?php $val = 2147483647; // we can't actually assign a number larger than 2^31-1 in php to an int, but if you're reading it from outside, it's easy to get larger than that. // split it into two 16 bit words $high= $val>>16; $low = $val & 65536; $packed= pack('nn',$high,$low); // we have a 32bit long packed number assigned to $packed $unpacked = unpack('nhigh\nlow',$packed); $final = ($unpacked['high'] << 16) + $unpacked['low']; ?> Of course this works equally as well as unpacking an externally created unsigned long. This is most usefull when dealing with bitmasks, where the high and low word don't need to be connected. Working with signed values is also possible, but I don't have any code examples to share (no need for them myself). ---- Server IP: 216.235.15.211 Probable Submitter: 204.112.176.136 ---- Manual Page -- http://www.php.net/manual/en/function.unpack.php Edit -- https://master.php.net/note/edit/76865 Del: integrated -- https://master.php.net/note/delete/76865/integrated Del: useless -- https://master.php.net/note/delete/76865/useless Del: bad code -- https://master.php.net/note/delete/76865/bad+code Del: spam -- https://master.php.net/note/delete/76865/spam Del: non-english -- https://master.php.net/note/delete/76865/non-english Del: in docs -- https://master.php.net/note/delete/76865/in+docs Del: other reasons-- https://master.php.net/note/delete/76865 Reject -- https://master.php.net/note/reject/76865 Search -- https://master.php.net/manage/user-notes.php