使用 PHP 从远程服务器下载多个图像(大量图像)

问题描述：

我正在尝试从外部服务器下载大量文件(大约 3700 个图像).这些图片每个大小从 30KB 到 200KB.

I am trying to download lots of files from an external server (approx. 3700 images). These images go from 30KB to 200KB each.

当我在 1 张图像上使用 copy() 函数时，它起作用了.当我循环使用它时，我得到的只是 30B 图像(空图像文件).

When I use the copy() function on 1 image, it works. When I use it in a loop, all I get are 30B images (empty images files).

我尝试使用 copy、cURL、wget 和 file_get_contents.每次，我要么得到很多空文件，要么什么都没有.

I tried using copy, cURL, wget, and file_get_contents. Every time, I either get a lot of empty files, or nothing at all.

这是我试过的代码:

wget:

exec('wget http://mediaserver.centris.ca/media.ashx?id=ADD4B9DD110633DDDB2C5A2D10&t=pi&f=I -O SIA/8605283.jpg');

复制:

if(copy($donnees['PhotoURL'], $filetocheck)) {
  echo 'Photo '.$filetocheck.' updated<br/>';
}

卷曲:

$ch = curl_init();
$source = $data[PhotoURL];
curl_setopt($ch, CURLOPT_URL, $source);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$data = curl_exec ($ch);
curl_close ($ch);

$destination = $newfile;
$file = fopen($destination, "w+");
fputs($file, $data);
fclose($file);

似乎没有任何工作正常.不幸的是，我没有太多选择可以一次下载所有这些文件，我需要一种方法使其尽快运行.

Nothing seems to be working properly. Unfortunately, I don't have much choice to download all these files at once, and I need a way to make it work as soon as possible.

非常感谢，安东尼

答

我为此使用了这个功能并且效果很好.

I used this function for that and worked pretty well.

function saveImage($urlImage, $title){

    $fullpath = '../destination/'.$title;
    $ch = curl_init ($urlImage);
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_BINARYTRANSFER,1);
    $rawdata=curl_exec($ch);
    curl_close ($ch);
    if(file_exists($fullpath)){
        unlink($fullpath);
    }
    $fp = fopen($fullpath,'x');
    $r = fwrite($fp, $rawdata);

    setMemoryLimit($fullpath);

    fclose($fp);

    return $r;
}

结合另一个防止内存溢出:

Combined with this other one to prevent memory overflow:

function setMemoryLimit($filename){
   set_time_limit(50);
   $maxMemoryUsage = 258;
   $width  = 0;
   $height = 0;
   $size   = ini_get('memory_limit');

   list($width, $height) = getimagesize($filename);
   $size = $size + floor(($width * $height * 4 * 1.5 + 1048576) / 1048576);

   if ($size > $maxMemoryUsage) $size = $maxMemoryUsage;

   ini_set('memory_limit',$size.'M');

}

使用 PHP 从远程服务器下载多个图像(大量图像)

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