SLEEKDB
SleekDB - A NoSQL Database made using PHP
SleekDB is a simple flat file NoSQL like database implemented in PHP without any third-party dependencies that store data in plain JSON files.
It is not comparable with databases like Sqlite, MySQL, PostgreSQL and MariaDB because they are relational databases! SleekDB is a NoSQL database and therefore more comparable with for example MongoDB.
It is not designed to handle heavy-load IO operations, it is designed to have a simple solution where all we need a database for is managing a few gigabytes of data. You can think of it as a database for low to medium operation loads.