PHP / cURL错误7; 无法连接到主机

Question

因此，我一直遇到相同的错误...我已经花了几个小时试图找到解决方法，但似乎找不到丢失的部分。 许多其他人询问堆栈溢出错误7，但没有一个与我的情况类似。

基本上，我使用cURL下载通过XML feed发送的图像。 我的整个脚本都能正常工作，所有程序都可以运行，我在下面编写的功能甚至可以下载成千上万张图片（有时最多可以下载到3000张图片）。

我想我的问题是，为什么下载3000张图像后，它会无法连接？

function downloadImage($location, $imagesPath, $imageName) {

    //Location fix
    $location = str_replace(" ", "%20", $location);

    $url  = $location;
    $path = $imagesPath . $imageName;
    $fp = fopen($path, 'w');    

    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_FILE, $fp);
    curl_setopt($ch, CURLOPT_FRESH_CONNECT, true);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 0); //Wait indefinitately      
    curl_setopt($ch, CURLOPT_DNS_USE_GLOBAL_CACHE, false);

    $data = curl_exec($ch); 
    if ($data === false) {
      echo "DownloadImage cURL failed 1: (" . curl_errno($ch) . ") " . curl_error($ch) . "<br/>";
      //exit;
    }           
    curl_close($ch);


    fclose($fp);        

}

Answer 1

因此，为了使其正常工作，我不得不在该功能上加一个瓶颈，以使其稍慢一些。 正如安德鲁西（Andrewsi）所建议的那样，该远程站点由于下载图像太快而使我无法使用。 为了限制该功能，我将每个图像通过FTP传输到远程服务器（因为无论如何都需要这样做）。

最终函数如下所示：

function downloadImage($location, $imagesPath, $imageName, $ch3, $feedFTPinfo) {

//Location fix
//$location = str_replace(" ", "%20", $location);   

$url  = $location;
$path = $imagesPath . $imageName;

$fp = fopen($path, 'w');    
$ch2 = curl_init(); // Initiate cURL for downloading images

//Setup the cURL options for the second handle ($ch2)
curl_setopt($ch2, CURLOPT_URL, $url);
curl_setopt($ch2, CURLOPT_FILE, $fp);   
curl_setopt($ch2, CURLOPT_CONNECTTIMEOUT, 0); //Wait indefinitately     
curl_setopt($ch2, CURLOPT_FOLLOWLOCATION, true);

//Execute the cURL session
$data2 = curl_exec($ch2); 

//Resize Images
$image = new SimpleImage();
$image->load($url); 
$imageNameSm = str_replace(".jpg", "", $imageName);
$imageNameSm = $imageNameSm."_sm2.jpg"; 
$image->resizeToWidth(120);
$image->save($imagesPath . $imageNameSm);   
$smPath = $imagesPath . $imageNameSm;

//Find out if there were any issues
if ($data2 === false) {
  echo "DownloadImage cURL failed 1: (" . curl_errno($ch2) . ") " . curl_error($ch2) . "<br/>";
  //exit;
} else {
    //There weren't any issues downloading the file, move it to the speficifed ftp server

    if (!empty($feedFTPinfo)) {

        $localfile = $path;
        $fp = fopen($localfile, 'r');

        //Setup the options for the 3rd handle
        curl_setopt($ch3, CURLOPT_URL, $feedFTPinfo.$imageName);
        curl_setopt($ch3, CURLOPT_CONNECTTIMEOUT, 0); //Wait indefinitately 
        curl_setopt($ch3, CURLOPT_UPLOAD, 1);
        curl_setopt($ch3, CURLOPT_INFILE, $fp);
        curl_setopt($ch3, CURLOPT_INFILESIZE, filesize($localfile));

        //Execute the 3rd cURL handle
        $data3 = curl_exec($ch3);

        //Find out if there were any issues with the execution
        if ($data3 === false) {
            echo "Uploading the image via FTP failed: (" . curl_errno($ch3) . ") " . curl_error($ch3) . "<br/>";
            //exit;
        }

        $localfile = $smPath;
        $fp = fopen($localfile, 'r');

        //Setup the options for the 3rd handle
        curl_setopt($ch3, CURLOPT_URL, $feedFTPinfo.$imageNameSm);
        curl_setopt($ch3, CURLOPT_CONNECTTIMEOUT, 0); //Wait indefinitately 
        curl_setopt($ch3, CURLOPT_UPLOAD, 1);
        curl_setopt($ch3, CURLOPT_INFILE, $fp);
        curl_setopt($ch3, CURLOPT_INFILESIZE, filesize($localfile));

        //Execute the 3rd cURL handle
        $data3 = curl_exec($ch3);

        //Find out if there were any issues with the execution
        if ($data3 === false) {
            echo "Uploading the small image via FTP failed: (" . curl_errno($ch3) . ") " . curl_error($ch3) . "<br/>";
            //exit;
        }           




    }


}

curl_close($ch2); //Close the cURL handle that downloads images
fclose($fp);
}

如果您不需要通过ftp来创建瓶颈，则可以在downloadImage函数中使用php的sleep （秒）或usleep （微秒）函数来创建类似的瓶颈。

• sleep文档： http : //php.net/manual/zh/function.sleep.php
• usleep文档： http : //php.net/manual/zh/function.usleep.php

希望这个理论可以帮助别人。