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50-drops-of-php
Open source and free e-book, that collects collects more than 50 useful, unknown, underrated PHP functions or stuff discovered, used, and learned during PHP's daily use.
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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.
It is open-source, so you can find Markdown source files and above all, a lot of examples and snippets in this repository: https://github.com/roberto-butti/50-drops-of-php (feel free to "star" the project on GitHub)
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.