如何使用PHP构建动态变量？ [英] How do I build a dynamic variable with PHP?

问题描述

我正在尝试在PHP中构建一个动态变量，尽管在StackOverflow上已经有一些关于这个问题的问题，我仍然很难...：/

变量是我从来没有理解的东西 - 希望有人能指出我的方向正确。 ：$ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ >子节[$ {$ grandchild ['id']}] - > page [$ {$ greatgrandchild ['id']}] =蓬松的兔子;

显然，上述不起作用，但如果我硬编码一个变量：

  $ data ['query']  - > section [0]  - >小节[3]  - > page [6] =Very蓬松的兔子 
  

...然后一切都好，显然我没有正确构建动态变量。任何想法？

更新：

嗯，好的，我应该指出，这些不是一个数组 - 我使用指定为每个节点的属性的ID来处理XML中的节点，因此XML具有以下结构：

 code><字幕> 
< section id =0> 
<子部分id =0> 
< page id =1>我要写的内容< / page> 
< page id =2>我要写的内容< / page> 
< page id =3>我要写的内容< / page> 
< / subsection> 
< / section> 
< / subtitles> 
  

希望这有助于更好地解释事情。 ：）

解决方案

为什么你认为你需要动态变量？这不是只是做你想要的：

  $ data ['query']  - > section [$ child [ id']]  - >子节[$ grandchild ['id']]  - > page [$ greatgrandchild ['id']] =蓬松的兔子; 
  

I'm trying to build a dynamic variable in PHP and despite looking at a number of the questions on the matter already here on StackOverflow I'm still stumped... :/

Variable variables is something I've never quite understood - hopefully someone here can point me in the right direction. :)

$data['query']->section[${$child['id']}]->subsection[${$grandchild['id']}]->page[${$greatgrandchild['id']}] = "Fluffy Rabbit";

Onviously the above does not work but if I hard code a variable as such:

$data['query']->section[0]->subsection[3]->page[6] = "Very Fluffy Rabbit";

...then all is fine, so obviously I'm not building my dynamic variable correctly. Any ideas?

UPDATE:

Hmm, ok I should have pointed out that these are not keys in an array - I'm addressing nodes in the XML using an ID which is specified as an attribute for each node, so the XML has the following structure:

<subtitles>
<section id="0">
<subsection id="0">
<page id="1">My content that I want to write</page>
<page id="2">My content that I want to write</page>
<page id="3">My content that I want to write</page>
</subsection>
</section>
</subtitles>

Hopefully that helps explain things a little better. :)

解决方案

Why do you think you need dynamic variables here? Doesn't this just do what you want:

$data['query']->section[$child['id']]->subsection[$grandchild['id']]->page[$greatgrandchild['id']] = "Fluffy Rabbit";

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