从Google App Engine for PHP加载远程XML [英] Load remote XML from Google App Engine for PHP

问题描述

我想从第三方服务器加载远程和动态的XML文件到我的GAE-PHP应用程序中：

  $ itemId = 5; 
 $ uri =http://www.myserver.com/getInfoItem.php?itemId={$itemId}&format=xml; 
  

我试图使用simplexml_load_file函数加载XML信息：

  if（$ xmlItem = simplexml_load_file（$ uri））{
 //处理XML信息的代码
} 
  

但是这会导致这个错误：

  PHP警告：simplexml_load_file（）：I / O警告：未能加载外部实体...
  

因此，我更改了代码，并尝试将XML加载为通用文本文件。这样，它就能按预期工作：

  if（$ fileContents = file_get_contents（$ uri））{
 $ xmlItem = simplexml_load_string（$ fileContents）; 
 //处理XML信息的代码
} 
  

我在想两个函数使用相同的 http wrapper 来获取远程内容，但这似乎不是以这种方式工作。我也查看了GAE 网址提取文档。

我的问题是：为什么第一种方法不起作用？我错过了什么？

解决方案

默认情况下，我们已禁用外部实体的自动加载，您必须选择加入。

 libxml_disable_entity_loader（false）; 
  

。这在禁用功能一节中有详细介绍

这涉及一个额外的步骤：首先，您必须创建一个 php.ini 文件，其中包含此line：

  google_app_engine.enable_functions =libxml_disable_entity_loader
  

I want to load a remote and dynamic XML file from a third party server into my GAE-PHP application:

$itemId = 5;
$uri = "http://www.myserver.com/getInfoItem.php?itemId={$itemId}&format=xml";

I have tried to load the XML information using the simplexml_load_file function:

if ($xmlItem = simplexml_load_file($uri)) {
  // Code dealing with the XML info
}

But that leads always to this error:

PHP Warning: simplexml_load_file(): I/O warning : failed to load external entity "..."

So, I have changed the code and I try load the XML as a generic text file. This way, it works as expected:

if ($fileContents = file_get_contents($uri)) {
  $xmlItem = simplexml_load_string($fileContents);
  // Code dealing with the XML info
}

I was thinking the two functions get the remote contents using the same http wrapper, but that does not seem to work this way. I have had a look to to the GAE URL Fetch documentation, too.

My question is: Why the first approach does not work? Am I missing something?

解决方案

We've disabled automatic loading of external entities by default, you have to opt in.

Try putting

libxml_disable_entity_loader(false);

before you're call. This is documented in the Disabled Functions section

This involves one additional step: First, you must create a php.ini file containing this line:

google_app_engine.enable_functions = "libxml_disable_entity_loader"

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