John Davidson

arrays - Find latest children in nested categories php

0 comments
Message:


I tried to parse a JSON using PHP from url. I need a list of item that have no children - means children field should be empty array and parent_id shouldn't be 0 - means not be parents.


JSON:


{
"body": {
"data": [
{
"id": 1,
"name": "car",
"parent_id": "0",
"children": [
{
"id": 2,
"name": "bmw",
"parent_id": "1",
"children": [
{
"id": 4,
"name": "bmw i8",
"parent_id": "2",
"children": []
}
]
},
{
"id": 3,
"name": "mustang",
"parent_id": "1",
"children": []
}
]
},
{
"id": 5,
"name": "clothes",
"parent_id": "0",
"children": []
},
{
"id": 6,
"name": "mobile",
"parent_id": "0",
"children": [
{
"id": 7,
"name": "apple",
"parent_id": "6",
"children": [
{
"id": 9,
"name": "Iphone 12 pro",
"parent_id": "7",
"children": []
},
{
"id": 10,
"name": "Iphone 11",
"parent_id": "7",
"children": []
}
]
},
{
"id": 8,
"name": "Xiaomi",
"parent_id": "6",
"children": []
}
]
}
]
}
}

Output Expected:


[4,3,9,10,8]

This is my php code that i tried and doesn't work.


    $CategoryUrl = file_get_contents(self::CATEGORY_URL,true);
$array = json_decode($CategoryUrl,true);
$list = array();
foreach( $array['body']['data'] as $value ){
if (($value['parent_id'] != 0) && empty($value['children'])) {
foreach( $value['children'] as $val ){
$list[] = $val;
}
}
}

print_r($list);


My Answer:
"categories": [
{
"id": 1,
"name": "Category 1",
"parent_id": 0,
"children": [
{
"id": 2,
"name": "Subcategory 1",
"parent_id": 1,
"children": []
},
{
"id": 3,
"name": "Subcategory 2",
"parent_id": 1,
"children": [
{
"id": 4,
"name": "Subcategory 3",
"parent_id": 3,
"children": []
}
]
}
]
},
{
"id": 5,
"name": "Category 2",
"parent_id": 0,
"children": []
},
{
"id": 6,
"name": "Category 3",
"parent_id": 0,
"children": [
{
"id": 7,
"name": "Subcategory 4",
"parent_id": 6,
"children": []
}
]
}
]
}

PHP code to find the latest children in nested categories:

php
$json = '{
"categories": [
{
"id": 1,
"name": "Category 1",
"parent_id": 0,
"children": [
{
"id": 2,
"name": "Subcategory 1",
"parent_id": 1,
"children": []
},
{
"id": 3,
"name": "Subcategory 2",
"parent_id": 1,
"children": [
{
"id": 4,
"name": "Subcategory 3",
"parent_id": 3,
"children": []
}
]
}
]
},
{
"id": 5,
"name": "Category 2",
"parent_id": 0,
"children": []
},
{
"id": 6,
"name": "Category 3",
"parent_id": 0,
"children": [
{
"id": 7,
"name": "Subcategory 4",
"parent_id": 6,
"children": []
}
]
}
]
}';

$data = json_decode($json, true);

function findLatestChildren($categories) {
$latestChildren = [];

foreach ($categories as $category) {
if (!empty($category['children'])) {
$latestChildren = array_merge($latestChildren, findLatestChildren($category['children']));
} else {
if ($category['parent_id'] != 0) {
$latestChildren[] = $category;
}
}
}

return $latestChildren;
}

$latestChildren = findLatestChildren($data['categories']);

print_r($latestChildren);


This PHP code will recursively search for the latest children in the nested categories and return a list of items that have no children and are not parents.

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