database password

Howdy all, Just wondering what -- if anything -- people are doing to protect plaintext database passwords in their PHP scripts. Ultimately, PHP needs a plaintext password to create the database connection, so it seems that obfuscation is the best we can achieve on this front. While not really secure by itself, obfuscation along with other measures (firewall, privilege separation, file system privileges, etc) can help slow someone down. So I've been looking into this approach at the moment. Any other ideas out there? Thanks, Roberto