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I ran into the same problem wih the latest version of PHP and Freetds (as of Feb. 18, 2004). I found that the only way to SELECT from a uniqueidentifier field is the following: 

SELECT LEFT(CAST(uniqueidentifierfield as char(64)), 36) AS thisfield FROM table

I use exactly the combination : PHP 4.3.4 + FreeTDS 0.61.2.
And we have no such problems.
Could you please send your configure strings ?

I am having a simular issue, however I am getting type (36) unknown and not 35. The SQl server is Enterprise 2000. and the field is a uniqueidentifier type. here is a line from the error:

Warning: mssql_query(): column 14 has unknown data type (36) in /opt/mysql-standard-4.0.18-pc-linux-i686/scripts/test.php on line 34

and here is the conf file
--------------------------------------------
[global]
        # TDS protocol version
        tds version = 8.0

;       initial block size = 512

        # uses some fixes required for some bugged MSSQL 7.0 server that
        # return invalid data to big endian clients
        # NOTE TDS version 7.0 or 8.0 should be used instead
;       swap broken dates = no
;       swap broken money = no

        # Database server login method, if both server and domain
        # logins are enabled, domain login is tried first if a domain
        # is specified, and if that fails the server login will be used.
        # OBSOLETE
;       try server login = yes
;       try domain login = no

        # The default authentication domain, can be overridden by
        # specifying a username with a domain prefix, e.g. DOMAIN\username
        # OBSOLETE use DOMAIN\username as username
;       nt domain = WORKGROUP

        # If the server responds with different domain try that one?
        # OBSOLETE never been used
;       cross domain login = no

        # Whether to write a TDSDUMP file for diagnostic purposes
        # (setting this to /tmp is insecure on a multi-user system)
;       dump file = /tmp/freetds.log
;       debug level = 10

        # Command and connection timeouts
;       timeout = 10
;       connect timeout = 10
        
        # If you get out of memory errors, it may mean that your client
        # is trying to allocate a huge buffer for a TEXT field.  
        # (Microsoft servers sometimes pretend TEXT columns are
        # 4 GB wide!)   If you have this problem, try setting 
        # 'text size' to a more reasonable limit 
        text size = 64512

[testserver]
        host = <<DELETED>>
        port = 1433
        tds version = 8.0

I see that the following is in ext/mssql/php_mssql.h:

#ifdef SQLUNIQUE /* FreeTSD 0.61+ */
#define SQLUNIQUE SYBUNIQUE
#endif

When configuring PHP via ./configure, is there a parameter I can send to configure to enable SQLUNIQUE?

I did get it working by removing the #ifdef & #endif, but is there another way?

My configuration:
freedts
./configure --prefix=/usr/local/freetds --with-tdsver=8.0

php
./configure --with-mssql=/usr/local/freetds --with-regex=php --with-config-file-path=/etc/php4/apache --disable-rpath --enable-memory-limit --disable-debug --with-layout=GNU --with-pear=/usr/share/php --with-mysql=shared  --with-apxs=/usr/bin/apxs

Open again dudes. 
Is there somebody who needs lessons in CVS usage, 
or what ?

Ok, once again a lesson in the usage of a really 
famous tool, called "diff", which could by new to some of 
you. A TIP : if you are searching a release manager, 
call me. It is "really" anoying to double-check 
PHP each time i need to update. 
 
 
/mssql/php_mssql.h iff -wu 
php-4.3.8.working/ext/mssql/php_mssql.h php-4.3.8/ext/ 
--- php-4.3.8.working/ext/mssql/php_mssql.h     2004-08-23 
15:56:59.000000000 +0200 
+++ php-4.3.8/ext/mssql/php_mssql.h     2004-04-21 
01:37:26.000000000 +0200 
@@ -38,7 +38,7 @@ 
 
 #if HAVE_FREETDS 
 #ifndef SHORT 
-//typedef short SHORT; 
+typedef short SHORT; 
 #endif 
 #define SQLTEXT SYBTEXT 
 #define SQLCHAR SYBCHAR 
@@ -62,7 +62,9 @@ 
 #define SQLIMAGE SYBIMAGE 
 #define SQLBINARY SYBBINARY 
 #define SQLVARBINARY SYBVARBINARY 
+#ifdef SQLUNIQUE /* FreeTSD 0.61+ */ 
 #define SQLUNIQUE SYBUNIQUE 
+#endif 
 #define DBERRHANDLE(a, b) dberrhandle(b) 
 #define DBMSGHANDLE(a, b) dbmsghandle(b) 
 #define DBSETOPT(a, b, c) dbsetopt(a, b, c, -1)

Please keep your insulting comments in front of you.

What version doesn't work? 

Behave like this and receive no help.

I would like to reopen this bug for php 5. The same appears to be ocurring there with freetds 0.61 from debian stable