PHPs会不会遵循301重定向？ [英] Will PHPs fopen follow 301 redirects?

问题描述

我们有一段遗留代码，（ab）通过HTTP使用对资源的fopen（）调用：@fopen（' http： //example.com '）。

We have a piece of legacy code that (ab)uses fopen() calls to resources over HTTP: @fopen('http://example.com').

我们希望将example.com移至另一台主机，然后发送301 Permanently Moved。
但是，我们并不完全确定@fopen（）是否会遵循这一点。初步测试表明它没有。但也许我会错过一些配置文章。

We want to move example.com to another host and then send 301 Permanently Moved. However, we are not entirely sure if @fopen() will follow this. Initial tests show me that it does not. But maybe I miss some configuration piece.

推荐答案

从版本5.1.0开始， max_redirects选项，这使得fopen HTTP包装器遵循 Location 重定向：

Since version 5.1.0, there's the max_redirects option, which makes the fopen HTTP wrapper follow the Location redirect:

要遵循的最大重定向数。值1或更小意味着不遵循重定向。

The max number of redirects to follow. Value 1 or less means that no redirects are followed.

默认为20。

如果配置禁用此功能，您可能需要明确设置它。从文档修改的示例：

You might want to set it explicitly, in case your config disables this. An example modified from the docs:

<?php

$url = 'http://www.example.com/';

$opts = array(
       'http' => array('method' => 'GET',
                       'max_redirects' => '20')
       );

$context = stream_context_create($opts);
$stream = fopen($url, 'r', false, $context);

// header information as well as meta data
// about the stream
var_dump(stream_get_meta_data($stream));

// actual data at $url
var_dump(stream_get_contents($stream));
fclose($stream);
?>

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