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@ 2021-10-02T19:02:37Z

<?php

$groupList = [
    [
        'id' => 1,
        'parent_id' => null,
        'category' => null,
        'children_list' => [
            [
                'id' => 3,
                'parent_id' => 1,
                'category' => null,
            ],
            [
                'id' => 4,
                'parent_id' => 1,
                'category' => 'Category number 20',
                'children_list' => [
                    [
                        'id' => 7,
                        'parent_id' => 4,
                        'category' => null,
                    ],
                    [
                        'id' => 8,
                        'parent_id' => 4,
                        'category' => 'Category number 30',
                    ],
                ],
            ],
        ],
    ],
    'id' => 2,
    'parent_id' => null,
    'category' => null,
    'children_list' => [
        [
            'id' => 5,
            'parent_id' => 2,
            'category' => null,
            'children_list' => [
                [
                    'id' => 6,
                    'parent_id' => 5,
                    'category' => null,
                ],
            ],
        ],
    ],
];


$filter = array_map(function ($n){return f($n);}, $groupList[0]);

echo '<pre>';
print_r($filter);

function f(&$a){
    foreach($a as $k=>&$r){
        if(!$r['category']) unset($a[$k]);
        if($r['children_list']) $r['children_list']=f($r['children_list']);
    }
    return $a;
}

Output for git.master, git.master_jit, rfc.property-hooks: Warning: foreach() argument must be of type array|object, int given in /in/T2Rba on line 59 Warning: foreach() argument must be of type array|object, null given in /in/T2Rba on line 59 Warning: foreach() argument must be of type array|object, null given in /in/T2Rba on line 59 Warning: Undefined array key "children_list" in /in/T2Rba on line 61 Warning: Undefined array key "children_list" in /in/T2Rba on line 61 Warning: Undefined array key "children_list" in /in/T2Rba on line 61 <pre>Array ( [id] => 1 [parent_id] => [category] => [children_list] => Array ( [1] => Array ( [id] => 4 [parent_id] => 1 [category] => Category number 20 [children_list] => Array ( [1] => Array ( [id] => 8 [parent_id] => 4 [category] => Category number 30 ) ) ) ) )

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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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