PHP cURL实时代理(流文件)

Question

目前我有一个如下的脚本:

<?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;
?>

问题是服务器只是在下载整个文件后发送响应.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.

用PHP和cURL可以实现吗？

Answer 1

这是可能的.您可以使用curl选项CURLOPT_WRITEFUNCTION指定一个回调,您将收到数据块,以便您可以在curl下载文件时将它们直接发送到客户端.

<?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);