Php output three-stage linkage data json format at one time

has the following data table

then output json data like this at once:

$.rawCitiesData = [
  {
    "name":"",
    "code":"id",
    "sub": [
      {
        "name": "",
        "code": "id",
        "sub":[
            {
              "name":"",
              "code":"110101"
            },
            {
              "name":"",
              "code":"110102"
            },
            {
              "name":"",
              "code":"110105"
            },
            {
              "name":"",
              "code":"110106"
            },
            {
              "name":"",
              "code":"110107"
            },
            {
              "name":"",
              "code":"110108"
            },
            {
              "name":"",
              "code":"110109"
            },
            {
              "name":"",
              "code":"110111"
            },
            {
              "name":"",
              "code":"110112"
            },
            {
              "name":"",
              "code":"110113"
            },
            {
              "name":"",
              "code":"110114"
            },
            {
              "name":"",
              "code":"110115"
            },
            {
              "name":"",
              "code":"110116"
            },
            {
              "name":"",
              "code":"110117"
            },
            {
              "name":"",
              "code":"110228"
            },
            {
              "name":"",
              "code":"110229"
            }
        ]
      }
    ]
  },

< H2 > only the id and name fields in the output data table do not need < / H2 >

data table description
pid=0 means top-level classification
child if equal to 1 means there are subordinate categories

also ask God to teach me how to write this php

Linkage php json infinite-pole-classification

Aug.23,2021

two scenarios, the first is to use recursion to traverse all the data.
the second is to cycle from level 1 to level 3, because your data seems to have only three levels.

<?php
//  pid 
// 
$items = [
    [
        'name' => '',
        'code' => '1',
        'pid' => '0'
    ],
    [
        'name' => '',
        'code' => '2',
        'pid' => '1'
    ],
    [
        'name' => '',
        'code' => '110101',
        'pid' => '2'
    ],
    [
        'name' => '',
        'code' => '110102',
        'pid' => '2'
    ]
];
$generateTree = function ($items, $parentKey = 'pid') {
    $tree = $temp = [];
    foreach ($items as $item) {
        $temp[$item['code']] = $item;
    }
    foreach ($items as $item) {
        if (isset($temp[$item[$parentKey]])) {
            $temp[$item[$parentKey]]['sub'][] = &$temp[$item['code']];
        } else {
            $tree[] = &$temp[$item['code']];
        }
        //  pid 
        unset($temp[$item['code']][$parentKey]);
    }
    return $tree;
};

print_r($generateTree($items));

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e5c2b9-4da26.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e5c2b9-4da26.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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