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

This is an example of doing it with PDO.

$id = $connection->executeQuery("SELECT CONNECTION_ID()")->fetchColumn();
ignore_user_abort(true);
while($row = $result->fetch()) {
  /* Processing ... */
  if (connection_aborted()) {
    $this->connection->executeQuery("KILL CONNECTION $id");
    break;
  }
}

Note: Keep an eye out for multiple connections, you may kill the wrong one.