Hi 
I have installed apache-ssl 1.3.27 with Php 4.3 with Classes DB Pear 1.3 and Client Sybase 11.9.2
in the Suse UnitedLinux 1.0 to connect in the Sybase ASE 11.9.2 . I work very well.

Now, I removed the client sybase and installed FreeTds 0.61, because I want to connect in the
MsSql 2000 and Sybase Ase 11.9.2 of the same web server. 

MsSql 2000
When I change the configuration of the my web pages to connect in the MsSql using DB Pear, all 
work well, except the function is_null that it returns a wrong result.
The test IF that are returns a wrong result is:
In the table USER from database MsSql exists one column called "DateThatBlockedThePassword" that 

have value NULL to user 'adminitrator' and the date '04/15/2003' to user 'operator'
The test in my  php web page is:
<?
...
$dsn = "mssql=db_user:my_password@sql_server/databasetest";
$db_conn = DB:connect( $dsn );
$sql = select UserCode, DateThatBlockedThePassword] from USER where LoginName = 

$_POST["LoginName"];
$if( DB:isError( $query_user = $db_conn->query( $sql ) {
    echo "Failed";
    exit( $query_user->getMessage() );
}

$array_user = $query_user->fetchRow( DB_FETCH_MODE_ASSOC );

if ( is_null ( $array_user[ DateThatBlockedThePassword]  ) )  {
       ..."execute others query , etc"
}
...
?>

This result is returning FALSE to both the users ;
When I remove this test, the script work correctly.

To Sybase
When I change the configuration of the my web pages to connect in the Sybase using DB Pear, occur 

a other error.

<?
...
$dsn = "sybase=db_user:my_password@sybase_server/databasetest";
$db_conn = DB:connect( $dsn );
$sql = select UserCode, LoginName, UserPassword from USER where LoginName = $_POST["LoginName"];

$if( DB:isError( $query_user = $db_conn->query( $sql ) {
    exit( $query_user->getMessage() );
}
...
?>

Return the message

Warning: Sybase message: Changed database context to 'databasetest'. (severity 10) in 

/usr/local/php/lib/php/DB/sybase.php on line 68
DB Error: DB backend not capable select UserCode, LoginName, UserPassword from USER where 

LoginName = 'administrator'

Obs. The db_user that is used to connect in the Sybase ASE have default database configured to 

'databasetest'

Procedures from the Instalation to:
--FreeTds--
./configure --prefix=/usr/local/freetds --with-tdsver=8.0 --enable-sybase-compat --enable-msdblib
make && make install
export SYBASE=/usr/local/freetds
export LD_LIBRARY_PATH=$SYBASE/lib
export PATH=$PATH:$SYBASE/bin

interface file in /usr/local/freetds/interfaces have:
sql_server
    query tcp 8.0 192.168.1.10 1433

sybase_server
    query   tcp 5.0 192.168.1.100 4100
    master tcp 5.0 192.168.1.100 4100

--PHP--
./configure --prefix=/usr/local/php --with-apache=../apache-1.3.27 

--with-sybase=/usr/local/freetds with-pgsql=/usr/local/pgsql --with-openssl=/usr/local 

--with-mcrypt=/usr/local
make && make install

php.ini have
[Sybase]
sybase.min_message_severity = 11
sybase.min_server_severity = 11
sybase.interface_file = /usr/local/freetds/interfaces
[MSSQL]
sybase.min_message_severity = 10
sybase.min_server_severity = 10

---Apache--
./configure --prefix=/usr/local/apache --activate-module=src/modules/php4/libphp4.a
make && make install

What it can be wrong. 
That is an FreeTds bug?

Obs.
I have same web pages in the IIS 5.0 web server with Windows 2000,  client native to ( MsSql 2000 

and Sybase ASE 11.9.2) , PHP 4.3 with classes DB Pear and it work well. 

Best Regards