Hello. I added that code and it works on our x86_64 bit Intel machine (just tested with your test.php). What environment are you using? I haven't tested the code on a 32bit machine and I believe that it will not work there. I should have propably added a note to the wiki that it wont work on 32bit environment.
- Juho Mäkinen On Wed, Jul 7, 2010 at 2:08 PM, john xie <shanfengg...@gmail.com> wrote: > > > http://wiki.apache.org/cassandra/FAQ#a_long_is_exactly_8_bytes > > /** > * Takes php integer and packs it to 64bit (8 bytes) long big endian > binary representation. > * @param $x integer > * @return string eight bytes long binary repersentation of the > integer in big endian order. > */ > public static function pack_longtype($x) { > return pack('C8', ($x >> 56) & 0xff, ($x >> 48) & 0xff, ($x >>> 40) & 0xff, ($x >> 32) & 0xff, > ($x >> 24) & 0xff, ($x >> 16) & 0xff, ($x >> > 8) & 0xff, $x & 0xff); > } > > /** > * Takes eight bytes long big endian binary representation of an > integer and unpacks it to a php integer. > * @param $x > * @return php integer > */ > public static function unpack_longtype($x) { > $a = unpack('C8', $x); > return ($a[1] << 56) + ($a[2] << 48) + ($a[3] << 40) + > ($a[4] << 32) + ($a[5] << 24) + ($a[6] << 16) + ($a[7] << 8) + $a[8]; > } > > test.php: > > $input=1; > > $output=unpack_longtype(pack_longtype($input)); > > print "input=".$input." but output = ".$output."\n"; > > $input=2; > > $output=unpack_longtype(pack_longtype($input)); > > print "input=".$input." but output = ".$output."\n"; > > $input=3; > > $output=unpack_longtype(pack_longtype($input)); > > print "input=".$input." but output = ".$output."\n"; > > but in log file: > > input=1 but output = 2 > > input=2 but output = 4 > > input=3 but output = 6 > > >
