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Let's talk about a case of PHP Infinitus classification, PHP classification case_PHP tutorial
Let's talk about a case of PHP Infinitus classification, PHP classification case_PHP tutorial
Jul 12, 2016 am 08:53 AM
Talk about a case of PHP Infinitus classification, PHP classification case
Author: Bailang Source: http://www.manks.top/php_tree_deep.html The copyright of this article belongs to the author , you are welcome to reprint, but this statement must be retained without the author's consent, and a link to the original text must be provided in an obvious position on the article page, otherwise we reserve the right to pursue legal liability. The original article has pictures.
In daily development, it is more or less inevitable to encounter the problem of Infinitus classification, because problems such as efficiency and logic have always made such problems more acute. Today we use the yii2 framework as the basis and the column Infinitus as an example to conduct a simple treatment of this problem.
First we have a column data table tree
The table structure is as shown below (original text with pictures)
The table structure looks very simple.
Let’s insert some test data
INSERT INTO `tree` (`id`, `parent_id`, `name`) VALUES (1, 0, 'A'), (2, 0, 'B'), (3, 1, 'a'), (4, 3, 'aa'), (5, 2, 'b'), (6, 4, 'aaa');
The tree structure is roughly as follows
|A |--a |----aa |------aaa |B |--b
This is exactly the data structure form we need. Let’s see how to process it to get the required results.
As we said before, it is based on yii2, so our writing method also follows object-oriented rules
class tree {
//訪問index查看樹形結(jié)構(gòu)
public function actionIndex () {
$data = self::getTree();
//為了方便測試，我們這里以json格式輸出
\Yii::$app->response->format = \yii\web\Response::FORMAT_JSON;
return $data;
}
//獲取樹
public static function getTree () {
//這里我們直接獲取所有的數(shù)據(jù)，然后通過程序進(jìn)行處理
//在無限極分類中最忌諱的是對數(shù)據(jù)庫進(jìn)行層層操作，也就很容易造成內(nèi)存溢出
//最后電腦死機(jī)的結(jié)果
$data = static::find()->all();
return self::_generateTree($data);
}
//生成樹
private static function _generateTree ($data, $pid = 0) {
$tree = [];
if ($data && is_array($data)) {
foreach($data as $v) {
if($v['parent_id'] == $pid) {
$tree[] = [
'id' => $v['id'],
'name' => $v['name'],
'parent_id' => $v['parent_id'],
'children' => self::_generateTree($data, $v['id']),
];
}
}
}
return $tree;
}
}
Let’s visit tree/index and take a look. The rendering is as follows
In this way we can see a very clear tree structure diagram, which is what we ultimately need.
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