Gladius DB is the most efficient flatfile database engine written in pure PHP, it is compatible with a subset of intermediate SQL92 and does not need any additional library to work. It perfectly understands SQL and is also supported through ADOdb Lite.
In this release some non-critical bugs have been fixed and an implementation of some SQL aggregate function is available for testing. In future we plan to offer a consistent implementation of aggregate functions and GROUP BY clause.
Don't forget to download the manual, you might need it to get started with Gladius DB.
The database files are fully backward compatible (and supported) since v0.5, no changes have been made to the database format.