A PHP internals mailing list thread discussing a PR to add COM_RESET_CONNECTION support in mysqlnd when reusing persistent database connections. The change ensures connections are returned to a blank-slate state (no active transactions, no leftover session variables) when reused across requests. The discussion covers minimum MySQL/MariaDB version requirements (5.7.3+ and 10.2+ respectively), whether an RFC is needed, PDO implementation details (adding a new 'reset connection' hook at the PDO level rather than overloading the liveness check function), and a related proposal to bump the minimum autoconf version to 2.71 for C11 support. The thread concludes with the author drafting an RFC for minimum supported versions in PHP 8.6 and updating the PR to add a proper reset connection hook for PDO.
