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@ 2019-04-30T23:03:24Z

<?php

$finalresult = array (
  101 => array(
    "username"=>  "1st user",
    "children"=> array  (
      104=> array  (
        "username"=>  "4th user",
        "children"=> array()
      ),
      105=> array  (
        "username"=>  "5th user",
        "children"=> array()
      ),
      108=> array  (
        "username"=>  "new guy",
        "children"=> array()
      )
    )
  ),
  102=> array  (
    "username"=>  "2nd user",
    "children"=> array() 
  ),
  103=> array  (
    "username"=>  "3rd user",
    "children"=> array()
  ) 
);

function count_children($tree) {
    $count = 0;
    foreach ($tree as $child) {
        $count++;
        if (is_array($child['children'])) {
            $count += count_children($child['children']);
        }
    }
    return $count;
}

echo count_children($finalresult);

Output for git.master, git.master_jit, rfc.property-hooks: 6

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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