我想检查一个网站是否存活在这个cURL代码？ [英] I want to check if a site is alive within this cURL code?

问题描述

我使用此代码从其他服务器获取响应/结果，我想知道如何检查网站是否活着？

I use this code to get a response/result from the other server and I want to know how can I check if the site is alive?

$ch = curl_init('http://domain.com/curl.php');
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$result = curl_exec($ch);
curl_close($ch);
if (!$result)
// it will execute some codes if there is no result echoed from curl.php

推荐答案

你真正需要做的是一个 HEAD 请求， code> 200 OK 消息。 您不需要为此进行全身申请。实际上，您根本不应该。

All you really have to do is a HEAD request to see if you get a 200 OK message after redirects. You do not need to do a full body request for this. In fact, you simply shouldn't.

function check_alive($url, $timeout = 10) {
  $ch = curl_init($url);

  // Set request options
  curl_setopt_array($ch, array(
    CURLOPT_FOLLOWLOCATION => true,
    CURLOPT_NOBODY => true,
    CURLOPT_TIMEOUT => $timeout,
    CURLOPT_USERAGENT => "page-check/1.0" 
  ));

  // Execute request
  curl_exec($ch);

  // Check if an error occurred
  if(curl_errno($ch)) {
    curl_close($ch);
    return false;
  }

  // Get HTTP response code
  $code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
  curl_close($ch);

  // Page is alive if 200 OK is received
  return $code === 200;
}

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