从嵌套的关联数组中获取单个值

问题描述：

For a setup script I write in PHP (for CLI, not web) I use a settings file as well as other other "content" files.

The settings file is built up like a regular ini-file

[header.subheader.moreheaders...]
keyA = value
keyB = value1|value2|...

"header.subheader.moreheaders..." and "keyX" will form a nested associative array with "value" as a string or "value1|value2|..." as a simple array (0-...).

Thanks to this accepted answer, I got so far that I can split the headers into a recursive array recursively. So far, so good.

However, as the content files shall contain references to these variables, I would like to be able to read out single values from that multi-dimensional array with string placeholders like $@R[header.subheader.moreheaders.key] or $@R[header.subheader.moreheaders.key.0] depending on them being a string or an array.

In the script, $@R[header.subheader.moreheaders.key.0] should convert into $SettingsVar[header][subheader][moreheaders][key][0] to return the appropriate value.

Neither the script nor the content files will know what is inside the settings file. The script just knows the general structure and placeholder $@R[...].

This answer appears to know what value will be in order to search for it.

Since I do not fully understand this answer, I am not sure if that would be the right way.

Is there a similar easy way to get the reverse from building that array?

对于我用PHP编写的设置脚本（对于CLI，而不是Web）我使用设置文件以及其他其他“内容”文件。 p>

设置文件就像常规的ini文件 p>

  [header.subheader.moreheaders。  ..] 
keyA = value 
keyB = value1 | value2 | ... 
  code>  pre> 
 
 “header.subheader.moreheaders ...”和“keyX”将形成 一个嵌套的关联数组，其中“value”为字符串，“value1 | value2 | ...”为简单数组（0 -...）。 p> 
 
 
感谢这个已接受的答案，到目前为止，我可以递归地将标题拆分为递归数组。 到目前为止，非常好。 p> 
 
 
但是，由于内容文件应包含对这些变量的引用，我希望能够使用字符串占位符从该多维数组中读出单个值 喜欢 $ @ R [header.subheader.moreheaders.key]  code>或 $ @ R [header.subheader.moreheaders.key.0]  code>，具体取决于它们是字符串还是 数组。 p> 
 
 
在脚本中， $ @ R [header.subheader.moreheaders.key.0]  code>应转换为 $ SettingsVar [header] [  subheader] [moreheaders] [key] [0]  code>返回适当的值。 p> 
 
 
脚本和内容文件都不知道设置文件中的内容。 该脚本只知道一般结构和占位符 $ @ R [...]  code>。 p> 
 
 
 这个答案似乎知道搜索它会有什么价值。 p> 
 
 

因为我不完全理解这个答案，我不确定这是不是正确的方法。 p> 
 
 
是否有类似的简单方法 从构建该数组获得相反的结果？ p> 
  div>

答

After some contemplation, I found a decent enough solution, which works for me (and hopefully others):

function GetNestedValue($aNestedKeys, $aNestedArray)
{
    $vValue = $aNestedArray;
    for($i = 0; $i < count($aNestedKeys); $i++)
    {
        if(array_key_exists($aNestedKeys[$i], $vValue))
        {
            $vValue = $vValue[$aNestedKeys[$i]];
        }
        else
        {
            $vValue = null;
            break;
        }
    }

    return $vValue;
}

Depending on what $aNestedKeys contain, it will either return a sub-array from $aNestedArray, a single value from it or null if any of the specified keys were not found.

从嵌套的关联数组中获取单个值

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