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@ 2019-09-10T10:13:38Z

<?php

$arr =
    [
    0 =>
    [
        "id"              => "1",
        "parent_cat_name" => "0",
        "cat_name"        => "Test 1",
        "status"          => "1",
        "position"        => "1",
        "created_at"      => "2019-09-03 09:27:45",
        "updated_at"      => "2019-09-03 11:00:54",
        "children"        =>
        [
            0 =>
            [
                "id"              => "2",
                "parent_cat_name" => "1",
                "cat_name"        => "Test 2",
                "status"          => "1",
                "position"        => "2",
                "created_at"      => "2019-09-03 09:28:19",
                "updated_at"      => "2019-09-03 11:01:00",
                "children"        =>
                [
                    0 =>
                    [
                        "id"              => "4",
                        "parent_cat_name" => "2",
                        "cat_name"        => "Test 4",
                        "status"          => "1",
                        "position"        => "4",
                        "created_at"      => "2019-09-03 09:35:20",
                        "updated_at"      => "2019-09-03 11:01:03",
                        "children"        =>
                        [
                            0 =>
                            [
                                "id"              => "5",
                                "parent_cat_name" => "4",
                                "cat_name"        => "Test 5",
                                "status"          => "1",
                                "position"        => "3",
                                "created_at"      => "2019-09-07 05:55:09",
                                "updated_at"      => "2019-09-07 05:55:09",
                            ],

                        ],

                    ],

                ],

            ],

        ],

    ],

    1 =>
    [
        "id"              => "3",
        "parent_cat_name" => "0",
        "cat_name"        => "Test 3",
        "status"          => "1",
        "position"        => "4",
        "created_at"      => "2019-09-03 09:35:10",
        "updated_at"      => "2019-09-03 11:00:58",
    ],

];
/**
 * @param $data
 */
/**
 * @param $data
 */
function custom_function($data)
{
    $result = [];
    if (is_array($data) && count($data) > 0) {
        $result[] = '<ul>';
        foreach ($data as $entry) {
            if (isset($entry['children'])) {
                $result[] = sprintf('<li>%s %s</li>', $entry['cat_name'], custom_function($entry['children']));
            } else {
                $result[] = sprintf('<li>%s</li>', $entry['cat_name']);
            }
        }
        $result[] = '</ul>';
    }
    return implode($result);
}
echo custom_function($arr);

Output for git.master, git.master_jit, rfc.property-hooks: <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>

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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