How to count the number of dynamic nested arrays in laravel dynamically

Question

{
    "name" : "lv0",
    "children" : [
       {
           "name" : "lv1",
           "children" : [
                {
                    "name" : "lv2",
                    "children" : [
                        {
                            "name" : "lv3"
                        }
                    ]
                }
            ]
       }
    ]
}

this is the json and I only wants to count the number of children's array, I am using this code:

$data[] = $request->children;
    $count = 0;
    foreach($data as $data){
        $count++;
    }
    return $count;

Kien Nguyen · Accepted Answer · 2021-02-18 05:48:04Z

1

Since you don't know how many nested children, you should use while loop:

$data = json_decode('{
    "name" : "lv0",
    "children" : [
       {
           "name" : "lv1",
           "children" : [
                {
                    "name" : "lv2",
                    "children" : [
                        {
                            "name" : "lv3"
                        }
                    ]
                }
            ]
       }
    ]
}');
$child = $data;
$count = 0;
while (property_exists($child, 'children')) {
    $count++;
    $child = $child->children[0];
}
echo $count;

Ouput:

answered Feb 18, 2021 at 5:48

Kien Nguyen

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15 Comments

Atif Mahmood Over a year ago

it is working but $data = json_decode('{ "name" : "lv0", "children" : [ { "name" : "lv1", "children" : [ { "name" : "lv2", "children" : [ { "name" : "lv3" } ] } ] } ] }'); this part is not for me how can i do this for request case?

Kien Nguyen Over a year ago

Since I don't know what your input looks like, I have assumed $data according to your question using json_decode

Atif Mahmood Over a year ago

inputs are the same as provided in json

Kien Nguyen Over a year ago

If the data in your request is already an object, just replace it for $data

Atif Mahmood Over a year ago

public function createTree($request) { // this is the function }

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