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@ 2022-04-28T10:54:12Z

<?php

$json = '{
    "id": 1,
    "label": "Beef",
    "sector_page_id": null,
    "value": 0,
    "tree_children": [
        {
            "id": 46,
            "label": "Beef",
            "sector_page_id": null,
            "value": 0,
            "tree_children": [
                {
                    "id": 47,
                    "label": "Beef - UK",
                    "sector_page_id": null,
                    "value": 15,
                    "tree_children": []
                },
                {
                    "id": 48,
                    "label": "Beef - Europe",
                    "sector_page_id": null,
                    "value": 25,
                    "tree_children": []
                },
                {
                    "id": 49,
                    "label": "Beef - Rest of World",
                    "sector_page_id": null,
                    "value": 0,
                    "tree_children": []
                }
            ]
        }
    ]
}';

$obj = json_decode($json);

function sum_recursive(object $obj): int {
    foreach ($obj->tree_children as $child) {
        $obj->value += sum_recursive($child);
    }
    return $obj->value;
}
        
sum_recursive($obj);
var_export($obj);

Output for git.master, git.master_jit, rfc.property-hooks: (object) array( 'id' => 1, 'label' => 'Beef', 'sector_page_id' => NULL, 'value' => 40, 'tree_children' => array ( 0 => (object) array( 'id' => 46, 'label' => 'Beef', 'sector_page_id' => NULL, 'value' => 40, 'tree_children' => array ( 0 => (object) array( 'id' => 47, 'label' => 'Beef - UK', 'sector_page_id' => NULL, 'value' => 15, 'tree_children' => array ( ), ), 1 => (object) array( 'id' => 48, 'label' => 'Beef - Europe', 'sector_page_id' => NULL, 'value' => 25, 'tree_children' => array ( ), ), 2 => (object) array( 'id' => 49, 'label' => 'Beef - Rest of World', 'sector_page_id' => NULL, 'value' => 0, 'tree_children' => array ( ), ), ), ), ), )

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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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