如何使用变量访问多维数组中的某些元素？
I am using arrays in PHP to modify xml data and write it back. This is the xml structure (simplified for demonstration purpose):
我在PHP中使用数组来修改xml数据并将其写回。这是xml结构(为了演示目的而简化):
<docs>
<folder>
<name>Folder name</name>
<date>20.06.2009</date>
<folder>
<name>Subfolder1</name>
<date></date>
</folder>
<folder>
<name>Subfolder1</name>
<date></date>
</folder>
<file>
<name></name>
</file>
</folder>
<name></name>
<date></date>
</docs>
Using this code, this is then parsed and transformed into a multidimensional array:
使用此代码,然后将其解析并转换为多维数组:
Array
(
[docs] => Array
(
[_c] => Array
(
[folder] => Array
(
[_c] => Array
(
[name] => Array
(
[_v] => Folder name
)
[date] => Array
(
[_v] => 20.06.2009
)
[folder] => Array
(
[0] => Array
(
[_c] => Array
(
[name] => Array
(
[_v] => Subfolder1
)
[date] => Array
(
[_v] =>
)
)
)
[1] => Array
(
[_c] => Array
(
[name] => Array
(
[_v] => Subfolder1
)
[date] => Array
(
[_v] =>
)
)
)
)
[file] => Array
(
[_c] => Array
(
[name] => Array
(
[_v] =>
)
)
)
)
)
[name] => Array
(
[_v] =>
)
[date] => Array
(
[_v] =>
)
)
)
)
Lengthy, I know. But now to the actual issue. If I want to add another file to a sub folder called Subfolder2 in this case, it's not a problem to do it by hand when u see the structure:
我知道,很冗长但现在到了实际问题。如果我想在这种情况下将另一个文件添加到名为Subfolder2的子文件夹中,当您看到结构时,手动执行它不是问题:
array_push($array['docs']['_c']['folder']['_c']['folder'][1], $newfile);
Now when I want to do it via the function that only knows a path to the folder (like docs/Folder name/Subfolder2), the algorithm has to analyze the array structure (check the name of each [folder], check if there is one or more folders ['_c'] or [number]) - all good, but I cannot find a way to create a variable that would have an "array" path for that new file.
现在当我想通过只知道文件夹路径的函数(如docs / Folder name / Subfolder2)来做这个时,算法必须分析数组结构(检查每个[文件夹]的名称,检查是否有一个或多个文件夹['_c']或[数字]) - 一切都很好,但我找不到一种方法来创建一个具有该新文件的“数组”路径的变量。
I was thinking somewhere along these lines:
我正在考虑这些方面:
$writepath = "['docs']['_c']['folder']...[1]"; // path string
array_push($array{$writepath}, $newfile);
Of course this is not a valid syntax.
当然这不是一个有效的语法。
So, how can I make a variable that contains a path through the array elements? I did a bit of research on w3c and php.net finding no helpful info on multidimensional arrays...
那么,我如何创建一个包含数组元素路径的变量呢?我对w3c和php.net做了一些研究,发现没有关于多维数组的有用信息......
If anyone has any other suggestions regarding structure, xml transformation/manipulation etc. by all means, I know it is far from sufficient way of data handling.
如果有人对结构,xml转换/操作等有任何其他建议,我知道它远远没有足够的数据处理方式。
Thanks for any input,
感谢您的任何意见,
Erik
Edit: Regarding the reference, is it possible to reference the reference? As that would be the way to move the 'pointer' through a set of arrays? Something as such:
编辑:关于参考,是否可以参考参考?那会是通过一组数组移动'指针'的方法吗?这样的东西:
$pointer = &$array['docs'];
if (key($pointer) == '_c') { $pointer = &$pointer['_c']; }
else (
// create an array with '_c' key instead of empty '_v' array
)
This syntax does not work.
此语法不起作用。
Edit: The syntax works, never mind... Thanks for all your help guys!
编辑:语法有效,没关系...感谢您的帮助!
2 个解决方案
#1
Although this isn't exactly an answer to your question: Instead of the xml<->array code you could use SimpleXML and its XPath capabilities.
虽然这不是您的问题的答案:您可以使用SimpleXML及其XPath功能代替xml < - >数组代码。
$pathToParentelement is more or less your $writepath.<?php $xml = '<docs> <folder> <name>Folder name</name> <date>20.06.2009</date> <folder> <name>Subfolder1</name> <date></date> </folder> <folder> <name>Subfolder2</name> <date></date> <folder> <name>Subfolder3</name> <date></date> </folder> </folder> </folder> </docs>';
$doc = new SimpleXMLElement($xml); $pathToParentelement = '//folder[name="Subfolder3"]'; $element = $doc->xpath($pathToParentelement); isset($element[0]) or die('not found');
$newFolder = $element[0]->addChild("folder"); $newFolder->name = "Subfolder4.1"; $newFolder->date = date(DATE_RFC822);
// let's see the result echo $doc->asxml();$ doc = new SimpleXMLElement($ xml); $ pathToParentelement ='// folder [name =“Subfolder3”]'; $ element = $ doc-> xpath($ pathToParentelement); isset($ element [0])或die('not found'); $ newFolder = $ element [0] - > addChild(“folder”); $ newFolder-> name =“Subfolder4.1”; $ newFolder-> date = date(DATE_RFC822); //让我们看看结果echo $ doc-> asxml();
更多相关文章
- 键入提示 - 指定对象数组
- 切出多维数组的一部分
- 仅获取单元素php数组中的值的最佳方法。
- 如何从其他文件调用数组
- php如何判断数组["a","b","c"]中是否含有"a"?
- 如何从databse中提取数据到2d数组中?
- 如果key在变量中，PHP如何从数组中获取值
- 是否可以在PHP中合并这些数组？ [重复]
- PHP打印输出数组内容及结构函数print_r与var_dump