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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
So, if all that's correct, why don't you no longer see include or require statements in code samples you see in the wild? Because most projects nowadays use Composer, and Composer implements a class autoloader that automates it all. And it's been widely adopted because it uses a PSR Autoloading Standards, which happens to use namespaces as convention to locate files.
I'd recommend looking at the routers for popular, simpler frameworks (both documentation and code) such as Slim. Also look at FastRoute which is the basis for most modern routers.