什么会导致DOMDocument.load从可访问的URL加载XML失败？ [英] What would cause DOMDocument.load to fail loading XML from a URL that is accessible?

问题描述

$doc = new DOMDocument();
if ($doc->load('http://foo.com/bar.xml')) {
  // good
} else {
  // wtf happened?
}

我可以 wget http://foo.com/bar.xml 从运行PHP代码的位置，所以我知道URL是可访问的。我认为它必须是HTTP错误以外的其他东西。

I can wget http://foo.com/bar.xml from the location where the PHP code is running, so I know the URL is accessible. I'm thinking it must be something other than an HTTP error.

我不知道还有什么可能导致失败。也许解析问题？ XML似乎是有效的（并通过W3C的验证测试）。从文档可以看出，无法确定

I'm not sure what else could be causing the failure. Maybe a parsing issue? The XML appears to be valid (and passes W3C's validation test). As far as I can tell from the documentation, there's no way to determine why the load failure occurred.

这是XML：

 <response> 
  <version>8</version> 
  <minversion>1</minversion> 
  <url>api.asp?</url> 
 </response>

推荐答案

我终于把它缩小到一个 PHP配置设置，名为 allow_url_fopen ，它在运行脚本的服务器上设置为关闭。

I finally narrowed it down to a PHP configuration setting called allow_url_fopen, which was set to Off on the server running the script.

I修改 php.ini 文件以启用此设置：

I modified the php.ini file to enable this setting:

allow_url_fopen = On

现在 DOMDocument.load 可以加载来自远程URL的XML。

And now DOMDocument.load can load XML from a remote URL.

警告：显然有一些安全问题，永久保持此设置。

WARNING: apparently there are some security issues with keeping this setting on permanently.

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