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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.
Besides that, we also have an http-tools package that you can use to build request handlers or real SDKs. There is a flexible transport layer in there, meaning you could switch the payload format of the api between json, XML, or whatever format you desire to support. https://github.com/phpro/http-tools
In php, there is the soap client that does a lot of stuff for you. However: if you want to do it well, you need to wrap a lot of stuff around the php soapclient. We provide this package in order to build decent soap clients: https://github.com/phpro/soap-client