btss/php/app/admin/model/Ztrees.php

<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2020/3/20
 * Time: 15:25
 */

namespace app\admin\model;


use think\facade\Db;

class Ztrees
{

    /**
     * 分级排序
     * @param $data
     * @param int $pid
     * @param string $field
     * @param string $pk
     * @param string $html
     * @param int $level
     * @param bool $clear
     * @return array
     */
    public static function sortListTier($data, $pid = 0, $field = 'pid', $pk = 'id', $html = '|-----', $level = 1, $clear = true)
    {
        static $list = [];
        if ($clear) $list = [];
        foreach ($data as $k => $res) {
            if ($res[$field] == $pid) {
                $res['html'] = str_repeat($html, $level);
                $res['level'] =$level;

                $list[] = $res;
                unset($data[$k]);
                self::sortListTier($data, $res[$pk], $field, $pk, $html, $level + 1, false);
            }
        }
        return $list;
    }

    public static function child_ztree($data,$pid=0,$field = 'pid',$level=1,$clear = true)
    {
        static $list = [];
        if ($clear) $list = [];
        foreach ($data as $k => $res) {
            if ($res[$field] == $pid) {
                $list["name"]=$res["name"];
                $list["city"]=$res["name"];
                unset($data[$k]);
                self::child_ztree($data, $res["id"], $field, $level + 1, false);
            }
        }
        return $list;

    }

    //无限分类数

    /** 无限分类
     * @param $array 分类数据
     * @param string $pid 分类上级变量
     * @param string $child 下一级变量名称
     * @return array
     */
    public static function SelectSon($array,$pid="pid",$child="son"){
        $items = array();
        foreach ($array as $value) {
            $items[$value['id']] = $value;
        }
        $tree = array();
        foreach ($items as $key => $item) {
            if (isset($items[$item[$pid]])) {
                $items[$item[$pid]][$child][] = &$items[$key];
            } else {
                $tree[$item[$pid]] = &$items[$key];
            }
        }
        return $tree;
    }
}