Zend_Config_Xml 奇怪的行为

2021-12-29 00:00:00 xml arrays config php zend-framework

我对 Zend_Config_Xml 有一个奇怪的问题.

I have a strange problem with Zend_Config_Xml.

这是一个例子.

使用这个 xml 文件 https://gist.github.com/883465

With this xml file https://gist.github.com/883465

此代码:

$config = new Zend_Config_Xml('config.xml'); 
var_dump($config->get('elements')->get('element')->toArray());

给出:

array(2) { 
  [0]=> 
  array(2) { 
    ["a"]=> 
    array(1) { 
      ["attr"]=> 
      string(2) "at" 
    } 
    ["e"]=> 
    array(3) { 
      [0]=> 
      array(1) { 
        ["attr"]=> 
        string(2) "at" 
      } 
      [1]=> 
      array(1) { 
        ["attr"]=> 
        string(2) "at" 
      } 
      [2]=> 
      array(1) { 
        ["attr"]=> 
        string(2) "at" 
      } 
    } 
  } 
  [1]=> 
  array(2) { 
    ["a"]=> 
    array(1) { 
      ["attr"]=> 
      string(2) "at" 
    } 
    ["e"]=> 
    array(3) { 
      [0]=> 
      array(1) { 
        ["attr"]=> 
        string(2) "at" 
      } 
      [1]=> 
      array(1) { 
        ["attr"]=> 
        string(2) "at" 
      } 
      [2]=> 
      array(1) { 
        ["attr"]=> 
        string(2) "at" 
      } 
    } 
  } 
}

使用这个 xml 文件 https://gist.github.com/883469

with this xml file https://gist.github.com/883469

它给出:

array(2) { 
  ["a"]=> 
  array(1) { 
    ["attr"]=> 
    string(2) "at" 
  } 
  ["e"]=> 
  array(3) { 
    [0]=> 
    array(1) { 
      ["attr"]=> 
      string(2) "at" 
    } 
    [1]=> 
    array(1) { 
      ["attr"]=> 
      string(2) "at" 
    } 
    [2]=> 
    array(1) { 
      ["attr"]=> 
      string(2) "at" 
    } 
  } 
}

我希望:

array(1) { 
  [0]=> 
  array(2) { 
    ["a"]=> 
    array(1) { 
      ["attr"]=> 
      string(2) "at" 
    } 
    ["e"]=> 
    array(3) { 
      [0]=> 
      array(1) { 
        ["attr"]=> 
        string(2) "at" 
      } 
      [1]=> 
      array(1) { 
        ["attr"]=> 
        string(2) "at" 
      } 
      [2]=> 
      array(1) { 
        ["attr"]=> 
        string(2) "at" 
      } 
    } 
  } 
}

当你想迭代元素时这很棘手

This is tricky when you want to iterate over elements 

$config = new Zend_Config_Xml('config.xml'); 
foreach($config->get('elements')->get('element') as $element);

如果有多个元素，这很好，但如果你只有一个，你最终会遍历元素孩子！

which is fine if there are more then one elements, but if you have only one, you'll end up iterating over element children!

有什么想法吗?

我想出了一个丑陋的解决方法:

I came up with an ugly workaround:

if (0 !== $config->get('elements')->get('element')) {//}

if (0 !== $config->get('elements')->get('element')) { // }

这有助于我确定元素标签下是否有多个元素.

This helps me to identify if there is more then one elements under elements tag.

很丑.

更聪明?

推荐答案

看起来 Zend_Config_Xml 显式地折叠了这样的 1-element 集合(源代码中有一个 if 语句可以做到这一点).一些可能的解决方法:

It seems that Zend_Config_Xml explicitly collapses such 1-element collections (there's an if statement in the source that does this). Some possible workarounds:

  • 重载 Zend_Config_Xml 并修复加载器代码，使其不会折叠 1 元素集合
  • 重载 Zend_Config_Xml 并重载 get() 以更简洁的方式包含您丑陋的解决方法.
  • 使用 SimpleXML 代替 Zend_Config_Xml
  • Overload Zend_Config_Xml and fix the loader code so it doesn't collapse 1-element collections
  • Overload Zend_Config_Xml and overload get() to include your ugly workaround in a cleaner way.
  • Use SimpleXML instead of Zend_Config_Xml

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