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framework-x
Framework X – the simple and fast micro framework for building reactive web applications that run anywhere.
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Thruway
PHP Client and Router Library for Autobahn and WAMP (Web Application Messaging Protocol) for Real-Time Application Messaging
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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.
Notably they only do it on their front page. All of their other docs use import statements: https://github.com/voryx/Thruway
Come to think of it, ReactPHP's front page is the only other place I've seen this done: https://reactphp.org/
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.