php - 使用 mysql 表数据创建项目符号列表

Question

我有一个类似于以下的表：

subcategory    category
------------------------
apples         fruits
oranges        fruits
pears          fruits
honda          cars
volvo          cars
audi           cars

使用 php 和 mySQL 打印出以下示例的简单方法是什么？

例子：

水果：

• 苹果
• 橘子
• 梨

汽车：

• 本田
• 沃尔沃
• 奥迪

我一直在努力解决这个问题几个小时，我很感激任何建议。

Answer 1

Get a list of categories, and then subcategories in each categories.

<?php

$categories = array();

foreach ($results as $result) {
    $category = $result['category'];
    $categories[$category][] = $result['subcategory'];
}

This will then give you a multidimensional array, with categories and the keys, and the sub-categories as the values. You can loop over them as thus:

<ul>
<?php foreach ($categories as $category => $subcategories): ?>
  <li>
    <?php echo $category; ?>
    <ul>
<?php foreach ($subcategories as $subcategory): ?>
      <li><?php echo $subcategory; ?></li>
<?php endforeach; ?>
    </ul>
  </li>
<?php endforeach; ?>
</ul>

Answer 2

$data = getData();
$dataByCat = array();
foreach($data as $row) {
   $dataByCat[$row['category']][] = $row;
}

$dataByCat will be an array in the "shape" of your bullet points.