Description:
------------
When unpacking hex with 'unpack', a "0" is appended to the end of the resulting string.  This did not happen in previous versions (this code functions in PHP 5.1.1).

A quick fix can be done by commenting out line 695 in "ext/standard/pack.c":

Change
   len -= argb % 2;
to 
   //len -= argb % 2;

This line is one of 6 differences in "pack.c" between version 5.1.1 and 5.1.2.  I wasn't able to understand why the "len -= argb %2" line was added.


Reproduce code:
---------------
<?php
   $HexString = 'c45dc988443fa8fff52ce7953bf049b8';

   $PackedHexString = pack( "h*" , $HexString );
   $UnpackedHex  =
     unpack( "h*Hex" , $PackedHexString );
   $UnpackedHex  = $UnpackedHex[ 'Hex' ];

   echo "$HexString\n";
   echo "$UnpackedHex\n";
?>

Expected result:
----------------
c45dc988443fa8fff52ce7953bf049b8
c45dc988443fa8fff52ce7953bf049b8


Actual result:
--------------
c45dc988443fa8fff52ce7953bf049b8
c45dc988443fa8fff52ce7953bf049b80