phpでmysqlデータベースの非同期クエリを実装

<!--?php
   
$host       = &#39;127.0.0.1&#39;;
$user       = &#39;root&#39;;
$password   = &#39;&#39;;
$database   = &#39;test&#39;;
   
/**
 * 期望得到额结果
 * array(
 *  1 =--> int,
 *  2 => int,
 *  3 => int
 * )
 */
$result = array(1=>0, 2=>0, 3=>0);
   
//异步方式[并发请求]
$time_start = microtime(true);
$links = array();
   
foreach ($result as $key=>$value) {
    $obj = new mysqli($host, $user, $password, $database);
    $links[spl_object_hash($obj)] = array(&#39;value&#39;=>$key, &#39;link&#39;=>$obj);
}
$done = 0;
$total = count($links);
   
foreach ($links as $value) {
    $value[&#39;link&#39;]->query("SELECT COUNT(*) AS `total` FROM `demo` WHERE `value`={$value[&#39;value&#39;]}", MYSQLI_ASYNC);
}
   
do {
   
    $tmp = array();
    foreach ($links as $value) {
        $tmp[] = $value[&#39;link&#39;];
    }
   
    $read = $errors = $reject = $tmp;
    $re = mysqli_poll($read, $errors, $reject, 1);
    if (false === $re) {
        die(&#39;mysqli_poll failed&#39;);
    } elseif ($re < 1) {
        continue;
    }
   
    foreach ($read as $link) {
        $sql_result = $link->reap_async_query();
        if (is_object($sql_result)) {
            $sql_result_array = $sql_result->fetch_array(MYSQLI_ASSOC);//只有一行
            $sql_result->free();
            $hash = spl_object_hash($link);
            $key_in_result = $links[$hash][&#39;value&#39;];
            $result[$key_in_result] = $sql_result_array[&#39;total&#39;];
        } else {
            echo $link->error, "\n";
        }
        $done++;
    }
   
    foreach ($errors as $link) {
        echo $link->error, "1\n";
        $done++;
    }
   
    foreach ($reject as $link) {
        printf("server is busy, client was rejected.\n", $link->connect_error, $link->error);
        //这个地方别再$done++了。
    }
} while ($done<$total);
var_dump($result);
echo "ASYNC_QUERY_TIME:", microtime(true)-$time_start, "\n";
   
$link = end($links);
$link = $link[&#39;link&#39;];
echo "\n";