在PHP中查找服务器响应时间

问题描述：

I am using the following code to find the server response time.

<?php
// check responsetime for a webbserver
function pingDomain($domain){
    $starttime = microtime(true);
    // supress error messages with @
    $file      = @fsockopen($domain, 80, $errno, $errstr, 10);
    $stoptime  = microtime(true);
    $status    = 0;

    if (!$file){
        $status = -1;  // Site is down
    }
    else{
        fclose($file);
        $status = ($stoptime - $starttime) * 1000;
        $status = floor($status);
    }
    return $status;
}
?>

I tested some websites using this code, and it returns that server response time is around 40 to 120 milliseconds. But when i open these sites its taking me around 2-4 seconds to get the first byte.

The server response time calculated by https://developers.google.com/speed/pagespeed/insights/ is also almost 2-4 seconds. So whats wrong with that code?

我使用以下代码查找服务器响应时间。 p>

  ＆lt;？php 
 //检查webbserver的响应时间
 
函数pingDomain（$ domain）{
 $ starttime = microtime（true）; 
 //使用@ 
 $ file = @fsockopen来抑制错误消息 （$ domain，80，$ errno，$ errstr，10）; 
 $ stoptime = microtime（true）; 
 $ status = 0; 
 
 if if（！$ file）{
 $ status = -1  ;  //网站已关闭
} 
其他{
 fclose（$ file）; 
 $ status =（$ stoptime  -  $ starttime）* 1000; 
 $ status = floor（$ status）; 
} \  n返回$ status; 
} 
？＆gt; 
  code>  pre> 
 
 我使用此代码测试了一些网站，并返回服务器响应时间大约为40到120 毫秒。 但是当我打开这些网站时，我花了大约2-4秒来获取第一个字节。 p> 
 
 
服务器响应时间由 https://developers.google.com/speed/pagespeed/insights/ 也差不多2-4秒。 那个代码怎么了？ p> 
  div>

答

You make no HTTP request to the server, but open a socket. What you are measuring here is not a server response time but a connection time.

You can try to load a page to get total connection, response, and data transfer time, e.g.:

file_get_contents("http://$domain/")

To retrieve header only:

get_headers("http://$domain/")

Or you can use curl for even more control.

在PHP中查找服务器响应时间

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