This doesn't show up in search - there does seem to be this page, but I can't see it linked from the sidebar: https://docs.couchbase.com/php-sdk/current/howtos/managing-connections.html
[DOC] Managing Connections - SDK3
Deliberately kept out of nav until there's some useful content...
We're working through PHP left-over tasks right now, so shouldn't be too long.
It will be in tonight's docs build.