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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.
JetBrains maintains their own stubs for PHPStorm: https://github.com/JetBrains/phpstorm-stubs
The official documentation English repo is available on GitHub at https://github.com/php/doc-en (there are also doc- repos for other language translations) and there's "Documentation discussion" mailing list
The official stubs are (to the best of my knowledge) maintained in the php-src repo as .stub.php files in the relevant folders (usually the ext/ subfolders) (eg. https://github.com/php/php-src/blob/master/ext/bcmath/bcmath.stub.php )
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.