无法限制PHP的cURL函数的下载大小 [英] Having trouble limiting download size of PHP's cURL function

问题描述

我使用PHP的cURL函数从steampowered.com读取配置文件。检索的数据是XML，只需要大约1000个字节。

I'm using PHP's cURL function to read profiles from steampowered.com. The data retrieved is XML, and only the first roughly 1000 bytes are needed.

我使用的方法是添加一个Range标题，溢出回答（ curl：如何限制GET的大小？）。我尝试的另一种方法是使用curlopt_range但是没有工作。

The method I'm using is to add a Range header, which I read on a Stack Overflow answer (curl: How to limit size of GET?). Another method I tried was using the curlopt_range but that didn't work either.

<?
$curl_url = 'http://steamcommunity.com/id/edgen?xml=1';
$curl_handle = curl_init($curl_url);

curl_setopt ($curl_handle, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($curl_handle, CURLOPT_CONNECTTIMEOUT, 2);
curl_setopt ($curl_handle, CURLOPT_HTTPHEADER, array("Range: bytes=0-1000"));

$data_string = curl_exec($curl_handle);

echo $data_string;

curl_close($curl_handle);
?>

执行此代码时，它会返回整个事物。

When this code is executed, it returns the whole thing.

我使用PHP版本5.2.14。

I'm using PHP Version 5.2.14.

推荐答案

服务器不支持Range标题。您可以做的最好的是，一旦收到更多的数据，你想要取消连接。示例：

The server does not honor the Range header. The best you can do is to cancel the connection as soon as you receive more data than you want. Example:

<?php
$curl_url = 'http://steamcommunity.com/id/edgen?xml=1';
$curl_handle = curl_init($curl_url);

$data_string = "";
function write_function($handle, $data) {
    global $data_string;
    $data_string .= $data;
    if (strlen($data_string) > 1000) {
        return 0;
    }
    else
        return strlen($data);
}

curl_setopt ($curl_handle, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($curl_handle, CURLOPT_CONNECTTIMEOUT, 2);
curl_setopt ($curl_handle, CURLOPT_WRITEFUNCTION, 'write_function');

curl_exec($curl_handle);

echo $data_string;

也许更干净，你可以使用http包装（这也将使用curl，如果它被编译 - with-curlwrappers ）。基本上，你会在循环中调用 fread ，然后在流上有 fclose ，当你得到的数据超过你想要的数量。您也可以使用传输流（使用 fsockopen 打开流，而不是 fopen 并手动发送标头）if allow_url_fopen 已停用。

Perhaps more cleanly, you could use the http wrapper (this would also use curl if it was compiled with --with-curlwrappers). Basically you would call fread in a loop and then fclose on the stream when you got more data than you wanted. You could also use a transport stream (open the stream with fsockopen, instead of fopen and send the headers manually) if allow_url_fopen is disabled.

这篇关于无法限制PHP的cURL函数的下载大小的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！