-
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.
That's probably not what you meant though. In order to keep your application running and waiting to reply to requests you can use a php library like react-php or php-pm.
There's also Swoole](https://www.swoole.co.uk/) that achieves the same thing (plus asynchronous coroutines) in a php extension. If you use Laravel the newly released Octane will leverage Swoole in Laravel.
That's probably not what you meant though. In order to keep your application running and waiting to reply to requests you can use a php library like react-php or php-pm.