How to quickly generate unlimited categories in php (with code)

This time I will show you how to quickly generate unlimited classifications in PHP (with code). What are the precautions for quickly generating unlimited classifications in PHP? The following is a practical case, let's take a look.

The simplest example:

<?php 
require(&#39;PHPTree.class.php&#39;);
//原始数据, 从数据库读出
$data = array(
	array(
		&#39;id&#39;=>1,
		'name'=>'book',
		'parent_id'=>0
	),
	array(
		'id'=>2,
		'name'=>'music',
		'parent_id'=>0
	),
	array(
		'id'=>3,
		'name'=>'book1',
		'parent_id'=>1
	),
	array(
		'id'=>4,
		'name'=>'book2',
		'parent_id'=>3
	)
);
$r = PHPTree::makeTree($data);
echo json_encode($r);
?>

Output:

[

               "id": 1,
            "name": "book",
"parent_id": 0,
"expanded": false, //Do not expand child nodes
"children": [
"children": [
"id": 3,
                                                                                                             "name": "book1",        
                  "parent_id": 1, 
                                                                       "name": " "id": 4,
"name": "BOOK2",
"Parent_id": 3,
"Leaf": True
}
]
}
] ##},
                                                                                                                                                                                                                               

The generated data is a tree structure and can be used in conjunction with front-end frameworks such as ExtJS. Git contains a demo of ExtJS, which you can refer to.

Demonstration:




If you don’t need to use the front-end framework and just use HTML output, you can use the following method:


$r = PHPTree::makeTreeForHtml($data);

Get a

one-dimensional array

, use the level field to identify the level of classification:

array(
 array(
  'id'=>1,
  'name'=>'用户管理',
  'parent_id'=>0,
  'level'=>0 //一级分类
 ),
 array(
  'id'=>1,
  'name'=>'用户列表',
  'parent_id'=>1,
  'level'=>1 //二级分类
 )
 ....
);

Output Select the tag:

echo '<h1>PHPTree树形结构</h1>';
echo '<select style="width:300px;">';
foreach($r as $item){
	echo '<option>';
	//根据所在的层次缩进
	echo str_repeat('......',$item['level']);
	echo $item['name'];
	echo '</option>';
}
echo '</select>';

Demo:

git contains a demo that outputs HTML, you can refer to it.

关于数据库的设计，只需要保证包含 id 和 parent_id 字段即可，其他字段可以自行添加，不会影响数据生成。parent_id是父级ID，如果是一级分类，就设为 0 。当然，字段也是可以配置的。请继续往下看，我将介绍一些进阶的使用方法。

展开子节点：

PHPTree::makeTree( $data, array(
 'expanded' => true
));

输出的数据为：

[
        {
            id:1,
            name:'book1',
            expanded:true,//展开子节点
            children:[
                ...
            ]
        }
]

自定义主键和父键：

//数据库读出
$data = array(
 array(
  'order_id'=>1, //主键
  'name'=>'book1',
  'pid'=>0, //父键
  ...
 )
);
PHPTree::makeTree( $data, array(
 'primary_key' => 'order_id',
 'parent_key' => 'pid'
));

输出的数据为：

[
        {
            order_id:1,
            name:'book1',
            pid:0,
            ...
        }
]

makeTreeForHtml 方法也支持配置主键和父键。

还有其他字段也可以自定义，但下面这些参数仅支持 makeTree 方法：

$r = PHPTree::makeTree($data, array(
 'expanded_key' => 'expanded',
 'children_key' => 'children',
 'leaf_key'  => 'leaf'
));

默认，这些字段的配置都是以ExtJS为参考的，如果你使用zTree框架的话，这些字段就需要重新配置了。

zTree 是一款强大的国产树形框架，它还支持 简单JSON格式，是一维数据格式，实际上就不需要用到PHPTree了。当然，PHPTree输出的数据层次感清晰，zTree也是支持的。

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