mysql的mysqli异步与php的携程

<?php

$begin = time();

//同步请求
function multi_sync(){
    $host = '192.168.2.87';
    $user = 'census';
    $password = 'census';
    $database = 'census';
    $mysqli = new mysqli($host, $user, $password, $database);

    $query   =  "SELECT sleep(1);" ;
    $query  .=  "SELECT sleep(1);" ;

    if ( $mysqli -> multi_query ( $query )) {
        do {
            echo "multi_sync_query \n";
            if ( $result  =  $mysqli -> store_result ()) {
                $ret = $result->fetch_array(MYSQLI_ASSOC);
                var_dump($ret);
            }
            // if ( $mysqli -> more_results ()) {
                 // printf ( "-----------------\n" );
            // }
        } while ( $mysqli -> more_results () && $mysqli -> next_result ());
    }
}
multi_sync();

//同步请求
/*
function sync(){
    $host = '192.168.2.87';
    $user = 'census';
    $password = 'census';
    $database = 'census';
    $db = new mysqli($host, $user, $password, $database);
    echo "sync_query 1\n";
    $statement1 = $db->query('select sleep(1)');
    $ret1 = $statement1->fetch_array(MYSQLI_ASSOC);
    echo "sync_query 2\n";
    $statement2 = $db->query('select sleep(1)');
    $ret2 = $statement2->fetch_array(MYSQLI_ASSOC);
    var_dump($ret1);
    var_dump($ret2);
}
sync();
*/

//携程异步---php携程，mysqlnd异步
/*
function f1(){
    $db = new db();
    $obj = $db->async_query('select sleep(1)');
    echo "f1 async_query \n";
    yield $obj;
    $row = $db->fetch();
    echo "f1 fetch\n";
    yield $row;
}

function f2(){
    $db = new db();
    $obj = $db->async_query('select sleep(1)');
    echo "f2 async_query\n";
    yield $obj;
    $row = $db->fetch();
    echo "f2 fetch\n";
    yield $row;
}

$gen1 = f1();
$gen2 = f2();

$gen1->current();
$gen2->current();

$gen1->next();
$gen2->next();

$ret1 = $gen1->current();
$ret2 = $gen2->current();

var_dump($ret1);
var_dump($ret2);
*/
echo time() - $begin;

class db{
    static $links;
    private $obj;

    function getConn(){
        $host = '192.168.2.87';
        $user = 'census';
        $password = 'census';
        $database = 'census';
        $this->obj = new mysqli($host, $user, $password, $database);
        self::$links[spl_object_hash($this->obj)] = $this->obj;
        return self::$links[spl_object_hash($this->obj)];
    }

    function async_query($sql){
        $link = $this->getConn();
        $link->query($sql, MYSQLI_ASYNC);
        return $link;
    }

    function fetch(){
        //for($i = 1; $i <= 5; $i++){
            $read = $errors = $reject = self::$links;
            $re = mysqli_poll($read, $errors, $reject, 1);
            foreach($read as $obj){
                if($this->obj === $obj){
                    $sql_result = $obj->reap_async_query();
                    $sql_result_array = $sql_result->fetch_array(MYSQLI_ASSOC);//只有一行
                    $sql_result->free();
                    return $sql_result_array;
                }
            }
        //}
    }
}

异步之后只要1秒，同步以及同步多请求，都是2秒