Kill MySQL query on user abort

Question

When running a long query from PHP, [how] can I kill the query if the user presses stop in their browser?

Take into consideration that I cannot call

Answer 1

PHP, in most cases, won't know that a connection was closed (since the user aborted) until it tries to send something over the network and then receives a SIGPIPE. The only thing you can do is try working with timeouts aborting to long queries or killing them from another process.