php测试vm与宿主机延迟

通过 curl模拟访问网站，接着进行sql查询，计算出时间戳

code :

<?php
date_default_timezone_set('UTC');

function Curlweb($url) {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_HEADER, 0);
        curl_exec($ch);
        curl_close($ch);
}

//微秒函数
function microtime_float()
{
    list($usec, $sec) = explode(" ", microtime());
    return ((float)$usec + (float)$sec);
}


function Connectdb($num,$add,$user) {
    while($num<=100){
        $time_start = microtime_float();

        // 先 curl 一下 Web 页面,模拟用户请求数据
        Curlweb('');
        $conn = mysql_connect($add,$user);

        if (!$conn) {
            die('Could not connect: ' . mysql_error());
        }
        //connect success select
        echo "Connected successfully\n\n";

        mysql_select_db("syslog");
        $sql = "select * from  systemevents where Message like '%ssh %'";
        $result = mysql_query($sql);

        if($result) {
            echo 'sql语句：' . $sql . '已经成功执行！';
            $n = mysql_num_rows($result);
            echo "$n\n";
        }
            mysql_close($conn);
        sleep(0.5);
    $num++;

    $time_end = microtime_float();
    $time = ($time_end - $time_start) * 1000;
    $tmp = sprintf("%5.2f",$time);
    echo $tmp."\t毫秒\n";

    }
}
Connectdb('1' , '127.0.0.1' , 'root');
?>