bzwrite() writes a string into the given bzip2 file
The file pointer. It must be valid and must point to a file
successfully opened by bzopen().
The written data.
If supplied, writing will stop after length
(uncompressed) bytes have been written or the end of
data is reached, whichever comes first.
Returns the number of bytes written, or
FALSE on error.
例 337. bzwrite() example
$str = "uncompressed data";
$bz = bzopen("/tmp/foo.bz2", "w");
bzwrite($bz, $str, strlen($str));