FreeTDS and PHP: empty strings and NVARCHAR

Hi,
yesterday I modified PHP and FreeTDS codes to make them work with empty
strings and nvarchar in stored procedures.

1. The empty_string.patch (against actual cvs of FreeTDS) is like the ct-lib
patch (so datalen==0 is not null).

2. The nvarchar_export.patch defines XSYBNVARCHAR in sybdb.h (to use
with php).

3. The freetds092_with_nvarchar.patch (against php 5.3.6 stable) fixes a
redefinition of type LBYTE to work with actual Freetds cvs and adds support
for type SQLNVARCHAR (to use with mssql_bind function).

The first patch could break the dblib standard so it could remain an unofficial
patch.

The second one shouldn't cause problems. It could be merged in the main
tree.

I hope I have done something useful.

Regards

-- 
Mattia