A php extension implementing the custom Cityhash algorithm found on Clickhouse DBMS source code (needed that for some work-related projects, then published it here).

According to Clickhouse docs the current Cityhash function is the original" from Google (or at least it's linked without further explanation) BUT the version they're running is a different one.

The proper files are located here but despite having the same headers and copyright info from Google their content is slighly different. The original implementations seems to be found here.

Check the Github repo for more info, source code and links.