PHP cURL 实时代理(流文件)

问题描述

目前我有一个如下所示的脚本:

Currently I have a script like the following:

<?php
$filename = "http://someurl.com/file.ext";
header('Content-Type: application/octet-stream');
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$filename);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 500);
$data=curl_exec($ch);
curl_close($ch);
echo $data;
?>

问题是服务器在下载整个文件后才发送响应.我想让它像流"一样工作，在下载文件时发送数据块作为响应.

The problem is that the server just send the response after download the whole file. I want to make it work like a "stream", sending chunks of data as response while the file is downloaded.

用 PHP 和 cURL 可以实现吗?

Is that possible to achieve with PHP and cURL?

推荐答案

这是可能的.您可以使用 curl 选项 CURLOPT_WRITEFUNCTION 指定一个回调，您将在其中接收数据块，以便在 curl 下载文件时将它们直接发送到客户端.

It's possible. You can use the curl option CURLOPT_WRITEFUNCTION to specify a callback where you'll receive chunks of data so you can send them directly to the client as curl downloads the file.

<?php

$filename = "http://someurl.com/file.ext";
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename="' . basename($filename) . '"');
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$filename);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 500);
curl_setopt($ch, CURLOPT_WRITEFUNCTION, function($curl, $data) {
    echo $data;
    return strlen($data);
});
curl_exec($ch);
curl_close($ch);

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