如何为 PHP cURL 下载设置最大大小限制? [英] How to set a maximum size limit to PHP cURL downloads?

问题描述

PHP cURL 下载是否有最大大小限制?IE.当传输达到一定的文件限制时，cURL 会退出吗?

Is there a maximum size limit to PHP cURL downloads? ie. will cURL quit when transfer reaches a certain file limit?

curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
$data = curl_exec($ch);

用于下载远程图像的站点.我想确保 cURL 在达到某个限制时会停止.

It's for a site that downloads remote images. I want to ensure that cURL will stop when it reaches a certain limit.

另外我的研究表明 getimagesize() 下载图像，返回它的大小，所以它不是一个选项.

Also my research shows getimagesize() downloads the image, to return its size so its not an option.

推荐答案

我有另一个答案可以更好地解决这种情况，让后人留在这里.

CURLOPT_WRITEFUNCTION 对此有好处，但 CURLOPT_PROGRESSFUNCTION 是最好的.

CURLOPT_WRITEFUNCTION is good for this but CURLOPT_PROGRESSFUNCTION is the best.

// We need progress updates to break the connection mid-way
curl_setopt($cURL_Handle, CURLOPT_BUFFERSIZE, 128); // more progress info
curl_setopt($cURL_Handle, CURLOPT_NOPROGRESS, false);
curl_setopt($cURL_Handle, CURLOPT_PROGRESSFUNCTION, function(
    $DownloadSize, $Downloaded, $UploadSize, $Uploaded
){
    // If $Downloaded exceeds 1KB, returning non-0 breaks the connection!
    return ($Downloaded > (1 * 1024)) ? 1 : 0;
});

请记住，即使 PHP.net 声明^ 对于 CURLOPT_PROGRESSFUNCTION:

接受五个参数的回调.

我的本​​地测试只有四 (4) 个参数，因为第一个(句柄)不存在.

My local tests have featured only four (4) parameters as the 1st (handle) is not present.

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