将我的JSON字符串格式化为< ol> PHP中的有序列表 [英] Format my JSON string into an <ol> ordered list in PHP

问题描述

我正在为一个宠物项目开发一个简单的CMS。我现在有一个JSON字符串，它包含一个菜单结构的页面ID和父页面ID的列表。

I'm working on a simple CMS for a pet project. I currently have a JSON string that contains a list of page ID's and Parent page ID's for a menu structure.

现在我想将此字符串转换为嵌套或分层列表（有序列表）。

I want to now convert this string into a nested or hierarchical list (ordered list).

我试过寻找循环，但似乎已经结束了一个过于复杂的子类范围。我努力在PHP中找到合适的轻量级解决方案。

I've tried looking looping through but seem to have ended up with an overly complex range of sub classes. I'm struggling to find a suitable light-weight solution in PHP.

以下是JSON：

Here's the JSON:

**[{"id":3,"children":[{"id":4,"children":[{"id":5}]}]},{"id":6},{"id":2},{"id":4}]**

以下是所需的输出：

Here's the desired output:

<ol>
  <li>3
    <ol>
      <li>4</li>
         <ol>
            <li>5</li>
         </ol>
    </ol>
  </li>
  <li>6</li>
  <li>2</li>
  <li>4</li>
</ol>

是否有内置于PHP的内容可以简化此过程？有没有人有过这方面的经验？

Is there anything built in to PHP that can simplify this process? Has anyone had any experience of this before?

我是PHP和SE的新手。期待您的回音。

I'm a newbie to PHP and SE. Looking forward to hearing from you.

这是我目前的进度（效果不理想）

<ol>
<?php
$json = '[{"id":3,"children":[{"id":4,"children":[{"id":5}]}]},{"id":6},{"id":2},{"id":4}]';
$decoded = json_decode($json);
$pages = $decoded;
foreach($pages as $page){
   $subpages = $decoded->children;
      echo "<li>".$page->id."</li>";
    foreach($subpages as $subpage){
        echo "<li>".$subpage->id."</li>";
   }
}
?>
</ol>

推荐答案

您可以使用递归深入数据。如果当前值是一个数组，则再次递归。考虑这个例子：

You can use recursion to get deep inside the data. If the current value is an array then recursion again. Consider this example:

$json_string = '[{"id":3,"children":[{"id":4,"children":[{"id":5}]}]},{"id":6},{"id":2},{"id":4}]';
$array = json_decode($json_string, true);

function build_list($array) {
    $list = '<ol>';
    foreach($array as $key => $value) {
        foreach($value as $key => $index) {
            if(is_array($index)) {
                $list .= build_list($index);
            } else {
                $list .= "<li>$index</li>";
            }
        }
    }

    $list .= '</ol>';
    return $list;
}

echo build_list($array);

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