The PHP language has a pretty good support for several different databases. MySQL has been embraced by PHP developers as the go-to database ever since the early days of the PHP language. While the initial emphasis was mostly on relational database management systems (RDBMS), other types of databases proved to be equally (or more) important for modern applications. The document and data key-value databases have been growing in popularity ever since.
Nowadays, it is not uncommon to see a PHP application making use of MySQL, Mongo, Redis, and possibly a few more databases or data stores all at once.
The NoSQL ("non SQL", "non relational" or "not only SQL") nature of Mongo allows building applications that generate massive volumes of new and possibly rapidly changing data types...
