PHP, PDO dsn-less connection to MS-SQL 2008

Andreas <[email protected]>
Newsgroups gmane.comp.db.tds.freetds
Message-ID <[email protected]> 
Hi,
can someone help me with PHP, PDO dsn-less connection to MS-SQL 2008, 
please?

I can connect with mssql_connect() without a DSN
und I can connect with PDO using a SystemDSN.

I'd rather connect with PDO but without any changes to configuration 
files on the web server.
I googled a bit but couldn't find a working solution, yet.
lmpx.com only provides a reader for public news (NNTP) servers. It is not affiliated with the servers or forums shown here and is not responsible for the content of articles, which is written by their respective authors.