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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.
I didn't even notice php.net had a search bar. I've always just used Google. Expecting any company to compete with Google's search is an unrealistic expectation. Just use Google for advanced searching.
If you're interested in seeing if you can improve the search facility, the PHP website source is available at https://github.com/php/web-php - the search facility is in search.php and results.php in the repository root. The autocomplete suggestions are controlled by js/search.js. It looks like some related files may also be in the manual/en directory.
It's now all on GitHub (both code and issues), with links at the top of every page (I think those currently still link to bugs.php.net which is actively monitored alongside GitHub issues)