SRR database simulator is a PHP class for storing information in "database tables". The PHP file which contains the class definition and the text files which contain the user data (tables, rows, etc.) can be in a unique directory, so backing up the database is easy. All the data is only stored as text.
Xyndravandria Dyverath composes and executes MySQL database queries programmatically. It represents a database system with PHP classes. Other classes are available to compose other parts of the queries like conditions, fields, values, limit clauses, etc. A separate class can also query database table metadata like table fields and primary keys.