对于那些感兴趣的人，这是我使用的：

<?php
// Connection to query on
$query_con = mysqli_connect($host, $user, $password, $name, $port);

// Connection to kill on
$kill_con = mysqli_connect($host, $user, $password, $name, $port);

// Start the query
$query_con->query($slow_query, MYSQLI_ASYNC);

// Get the PID
$thread_id = $query_con->thread_id;

// Ignore user abort so we can kill the query
ignore_user_abort(true);

do  {
    // Poll MySQL
    $links = $errors = $reject = array($mysqli->mysqli);
    $poll = mysqli_poll($links, $errors, $reject, 0, 500000);

    // Check if the connection is aborted and the query was killed
    if (connection_aborted() && mysqli_kill($kill_con, $thread_id)) {
        die();
    }
} while (!$poll);

// Not aborted, so do stuff with the result
$result = $link->reap_async_query();
if (is_object($result)) {
    // Select
    while ($row = $result->fetch_object()) {
        var_dump($row);
    }
} else {
    // Insert/update/delete
    var_dump($result);
}