PHP/cURL错误7;无法连接到主机

Question

因此，我一直遇到同样的错误...我已经搜索了几个小时试图找到一个决议，但我似乎无法找到缺失的一块。很多其他人在堆栈溢出时询问错误7，但没有一个与我的方案相似。

基本上，我使用cURL来下载通过XML feed发送的图像。我的整个脚本都能正常工作，一切都在运行，我下面写的功能甚至可以下载数以千计的图像（有时会上传到3000范围）。

我想我的问题是，为什么在下载3000张图像后它不能连接？

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

所以为了使这个工作，我不得不把一个瓶颈缓慢下来一点。正如Andrewsi所建议的那样，这个远程站点因为下载镜像太快而被迫关闭。为了阻止这个功能，我将每个镜像都FTP到远程服务器上（因为无论如何这都是必需的）。

最终功能是这样的：

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); 
} 

如果你不需要某个FTP到创建的瓶颈，你可以使用PHP的sleep（秒）或usleep（微秒）功能，您downloadImage功能内造成类似的瓶颈。

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

希望这个理论有助于别人了。