thanks yes, it works on x86_64
my environment: Darwin 10.4.0 Darwin Kernel Version 10.4.0: Fri Apr 23 18:28:53 PDT 2010; root:xnu-1504.7.4~1/RELEASE_I386 i386 is have any Compatible solutions on 64bit and 32bit? 2010/7/7 Juho Mäkinen <juho.maki...@gmail.com> > 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 > > > > > > > -- 谢善峰 johnxie 联系方式: MSN:johnxieg...@hotmail.com <msn%3ajohnxieg...@hotmail.com> GTALK: shanfengg...@gmail.com E_mail:john...@topgene.net <e_mail%3ajohn...@topgene.net> ------------------------------------------ 智信环宇 Internet Service On_Demand
