$url   = $argv[1]??'http://www.baidu.com'; //URL
$total = $argv[2]??100; //请求总数
$num   = $argv[3]??10; //并发数
$pern  = ceil($total/$num); //每并发平均分配请求数
$list  = [];
for ($i=0;$i<$num;$i++) {
    $pid = pcntl_fork();   //并发采用php多进程pcntl_fork
    if ($pid == 0) {
        $pid = posix_getpid();
        $mh  = curl_multi_init();
        $k   = 0;
        $t1  = microtime(true);
        $d   = [];
        for ($j=0;$j<$pern;$j++) {
            $t2 = microtime(true);
            $ch = curl_init();
            curl_setopt($ch, CURLOPT_URL, $url);
            curl_setopt($ch, CURLOPT_HEADER, 0);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
            curl_exec($ch);
            $t3  = microtime(true);
            $d[] = $t3 - $t2;
        }
        file_put_contents("/tmp/".$pid.".json", json_encode($d));//测试时间写入临时文件
        exit;
    } elseif ($pid) {
        $list[$pid] = $pid;
    }
}
while (pcntl_wait($status) != -1); //等待所有子进程结束后，计算统计数据
$data  = [];
$data1 = [];
foreach($list as $pid) {
    $d = json_decode(file_get_contents("/tmp/".$pid.".json", true));
    unlink("/tmp/".$pid.".json");
    $data1[$pid] = $d;
}
for ($i=0;$i<$pern;$i++) {
    foreach ($list as $pid) {
       if (count($data) < $total) {
           $data[] = $data1[$pid][$i];
       } else {
           break 2;
       }
    }
}
echo "平均响应时间:".(array_sum($data)/$total)."\n";
sort($data); //所有测试数据从小到大排序
$n95  = intval($total * 0.95);
$time = 0;
for ($i=0;$i<$n95;$i++) {
    $time += $data[$i];
}
echo "95%响应时间:".$time."\n";
echo "100%响应时间:".array_sum($data)."\n";