将数组数据转换为 <ul> <li> 宽度 PHP答案

【问题标题】：Converting Array data to <ul> <li> width PHP将数组数据转换为 <ul> <li> 宽度 PHP
【发布时间】：2012-09-08 16:42:51
【问题描述】：

在 MySQL 中，我的表如下所示：

http://sqlfiddle.com/#!2/76717.

CREATE TABLE IF NOT EXISTS `tbl_category` (
  `id` int(6) NOT NULL auto_increment,
  `parent_id` int(4) NOT NULL default '0',
  `name` varchar(255) NOT NULL,
  PRIMARY KEY  (`id`),
  KEY `parent_id` (`parent_id`)
) ENGINE=MyISAM  DEFAULT CHARSET=utf8;


INSERT INTO `tbl_category` (`id`, `parent_id`, `name`) VALUES
(1, 0, 'Category 1'),
(2, 0, 'Category 2'),
(3, 0, 'Category 3'),
(4, 1, 'Category 1. 1'),
(5, 1, 'Category 1. 2'),
(6, 1, 'Category 1. 3'),
(7, 4, 'Category 1. 1. 1'),
(8, 4, 'Category 1. 1. 2'),
(9, 4, 'Category 1. 1. 3');

我的数组

$arrCategories = array(
    array("id" => 1, "parent_id" => 0, "name" => "Category 1", "children" => array()
                array("id" => 4, "parent_id" => 1, "name" => "Category 1. 1", "children" => array()
                         array("id" => 7, "parent_id" => 4, "name" => "Category 1. 1. 1", "children" => array()),
                         array("id" => 8, "parent_id" => 4, "name" => "Category 1. 1. 2", "children" => array()),
                         array("id" => 9, "parent_id" => 4, "name" => "Category 1. 1. 3", "children" => array())
                                ),
                array("id" => 5, "parent_id" => 1, "name" => "Category 1. 2", "children" => array()),
                array("id" => 6, "parent_id" => 1, "name" => "Category 1. 3", "children" => array())        
        ),
    array("id" => 2, "parent_id" => 0, "name" => "Category 2", "children" => array()),
    array("id" => 3, "parent_id" => 0, "name" => "Category 3", "children" => array())
);

数组输出

我如何使它宽度 PHP ？

<ul>
 <li>Category 1
  <ul>
   <li>Category 1. 1
    <ul>
     <li>Category 1. 1. 1</li>
     <li>Category 1. 1. 2</li>
     <li>Category 1. 1. 3</li>
    </ul>
   </li>
   <li>Category 1. 2</li>
   <li>Category 1. 3</li>
  </ul>
 </li>
 <li>Category 2</li>
 <li>Category 3</li>
</ul>

这不能正常工作

<?php
echo "    <ul>\n";
foreach ($categories as $category) {
echo "     <li>".$category['ad'];

if ($category['children']) {
echo "      <ul>\n";
foreach ($category['children'] as $child) {
echo "       <li>".$child['ad']."</li>\n";
}
echo "      </ul>\n";
}
echo "     </li>\n";
}
echo "    </ul>\n";
?>

感谢现在对我有用，这就是功能...... http://ideone.com/u2GNV

但我认为无效的 ul 和 li 标签...

http://ideone.com/u2GNV 我的结果

<ul>
 <li>Category 1
  <ul>
   <li>Category 1. 1
    <ul>
     <li>Category 1. 1. 1</li>
    </ul>
    <ul>
     <li>Category 1. 1. 2</li>
    </ul>
    <ul>
     <li>Category 1. 1. 3</li>
    </ul>
   </li>
  </ul>

  <ul>
   <li>Category 1. 2</li>
  </ul>

  <ul>
   <li>Category  1. 3</li>
  </ul>
 </li>
</ul>

<ul>
 <li>Category 2</li>
</ul>

<ul>
 <li>Category 3</li>
</ul>

我认为有效的 w3 代码

<ul>
 <li>Category 1
  <ul>
   <li>Category 1. 1
    <ul>
     <li>Category 1. 1. 1</li>
     <li>Category 1. 1. 2</li>
     <li>Category 1. 1. 3</li>
    </ul>
   </li>
   <li>Category 1. 2</li>
   <li>Category 1. 3</li>
  </ul>
 </li>
 <li>Category 2</li>
 <li>Category 3</li>
</ul>

【问题讨论】：

标签： php recursion multidimensional-array categories hierarchical-data

【解决方案1】：

您可以创建一个函数来将所有数组解析为 menu like 块并使用递归：

对于那个数组：

function printMenu($array){
    foreach($array as $item){
        if(is_array($item) && isset($item['name'])){
            echo "<ul>\n";

                if(is_array($item['children'])){
                    echo "<li>".$item['name'];
                    printMenu($item);
                    echo "</li>\n";
                } else {
                    echo "<li>".$item['name']."</li>\n";
                }

            echo "</ul>\n\n";
        }
    }
}

来自 mysql 资源（基于您的表）：

$db = new PDO('mysql:host=localhost;dbname=test', 'root', '', array(PDO::ATTR_EMULATE_PREPARES => false, PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION));


function printMenu($array){
    foreach($array as $item){
        if(is_array($item) && isset($item['name'])){
            echo "<ul>\n";
                if(getChildren($item['id'], false)){
                    echo "<li>".$item['name'];
                    printMenu(getChildren($item['id'], true));
                    echo "</li>\n";
                } else {
                    echo "<li>".$item['name']."</li>\n";
                }

            echo "</ul>\n\n";
        }
    }
}

function getChildren($id, $return = false){
    global $db;
    $stmt = $db->prepare("SELECT * FROM `tbl_category` WHERE `parent_id` = :parent_id");
    $stmt->execute(array(':parent_id' => $id));
    $num = $stmt->rowCount();
    if($num){
        if($return){
            $row = $stmt->fetchAll(PDO::FETCH_ASSOC);
            return $row;
        }
        return true;
    }
    return false;
}


$query = "SELECT * FROM `tbl_category` WHERE `parent_id` = 0";
$stmt = $db->query($query);
$row = $stmt->fetchAll(PDO::FETCH_ASSOC);
printMenu($row);

结果：

类别 1
- 类别 1.1
  - 类别 1.1.1
  - 类别 1.1.2
  - 类别 1.1.3
- 1.2类
- 1.3类

2 类

第 3 类

【讨论】：

非常感谢。如何写出这个结果的$arrCategories 数组函数？
什么意思怎么写？你刚写的？如何将其从数据库中提取出来？
是的 @Mihai Iorga 数据库到数组 $arrCategories 对不起我的英语很糟糕我认为我的数组输出函数不起作用而且很长
请看我的函数和你的函数结果http://ideone.com/MguhQ
我无法添加你的函数，因为你没有使用来自数据库的递归，这个脚本工作正常，mysql_* 函数已被弃用，尝试更改为 PDO