PHP : Dynamically get multidimentional array child element value

Question

I want to get automatically children element value from array. It's multidimentional array format. You can see array format as like below

Note : Child element automatically generate. So, not want to static code logic.

I want to create category tree and that array structure looks like this below array format :

Used code :

public function buildTree(array $elements, $parentId = 0) {
        $branch = [];

        foreach ($elements as $element) {
            if ($element['parent_cat_name'] == $parentId) {
                $children = $this->buildTree($elements, $element['id']);
                if ($children) {
                    $element['children'] = $children;
                }
                $branch[] = $element;
            }
        }
        return $branch;
    }

Actual Result :

Test 1
- Test 2
  - Test 4
    - Test 5
Test 3

I want is not a question. Describe real problem that you have. — u_mulder
– u_mulder, Commented Sep 10, 2019 at 10:00
@u_mulder I can't able to generate actual result from this above array. — Ankita Patel
– Ankita Patel, Commented Sep 10, 2019 at 10:02

Rahul · Accepted Answer · 2019-09-10 10:16:30Z

1

Here is custom function to achieve the same,

function custom_function($data)
{
    $result = [];
    // checking if during recursion if data is array or not found
    if (is_array($data) && count($data) > 0) {
        $result[] = '<ul>';
        foreach ($data as $entry) {
            // checking if leaf node visited or not
            if (isset($entry['children'])) {
                $result[] = sprintf('<li>%s %s</li>', $entry['cat_name'], custom_function($entry['children']));
            } else {
                // leaf node visited just add name to li
                $result[] = sprintf('<li>%s</li>', $entry['cat_name']);
            }
        }
        $result[] = '</ul>';
    }
    // implode or ul to form a string
    return implode($result);
}
echo custom_function($arr);

I took the ref of my answer in the past which matches criteria to some extent.

Demo.

Output:-

<ul>
  <li>Test 1
    <ul>
      <li>Test 2
        <ul>
          <li>Test 4
            <ul>
              <li>Test 5</li>
            </ul>
          </li>
        </ul>
      </li>
    </ul>
  </li>
  <li>Test 3</li>
</ul>

EDIT 1

function custom_function($data)
{
    $result = [];
    if (is_array($data) && count($data) > 0) {
        //$result[] = '<ul>';
        foreach ($data as $entry) {
            if (isset($entry['children'])) {
                $result[] = [$entry['cat_name'], custom_function($entry['children'])];
            } else {
                $result[] = $entry['cat_name'];
            }
        }
        //$result[] = '</ul>';
    }
    return ($result);
}
$data= custom_function($arr);
print_r($data);

Output

Array
(
    [0] => Array
        (
            [0] => Test 1
            [1] => Array
                (
                    [0] => Array
                        (
                            [0] => Test 2
                            [1] => Array
                                (
                                    [0] => Array
                                        (
                                            [0] => Test 4
                                            [1] => Array
                                                (
                                                    [0] => Test 5
                                                )

                                        )

                                )

                        )

                )

        )

    [1] => Test 3
)

edited Sep 10, 2019 at 10:16

answered Sep 10, 2019 at 10:08

Rahul

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6 Comments

Ankita Patel Over a year ago

It's return : Undefined index: children

Rahul Over a year ago

I made changes, now refresh the page and check edited version of my answer.

Ankita Patel Over a year ago

It's look like perfect. Can you please return as array instead of li tags.

Rahul Over a year ago

Your output matches with mine. That's all you want it right? If you want it so, remove last implode condition and use that array as per your requirement

Ankita Patel Over a year ago

You are great !! Thanks for help me. Accepted !!

|

Mehak Sharma · Accepted Answer · 2019-09-10 10:35:12Z

0

<?php

        subarray($a);
        function subarray($aa){
            for($i=0;$i<count($aa);$i++){
                echo $aa[$i]['cat_name']."<BR>";
                if(array_key_exists("children",$aa[$i])){
                    $charr=$aa[$i]['children'];
                    subarray($charr);
                }               
            }
        }


?>

edited Sep 10, 2019 at 10:35

answered Sep 10, 2019 at 10:18

Mehak Sharma

12 bronze badges

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