Sybase offers an industrial-strength database that stands among other big competitors such as Oracle, Informix, and IBM's DB2. Unlike these other databases, Sybase is more available to developers with small budgets because of partnerships with application vendors. InterShop's electronic commerce server comes with a Sybase database. Microsoft's SQL Server 6.5 is a dressed-up version of Sybase. In fact, PHP's Sybase functions are able to connect to SQL Server databases. For the sake of code readability, there are function aliases for all the Sybase functions that start with mssql_ instead of sybase_, but I've left them out of the reference to save space. Table 13.11 lists all mssql_ aliases.