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@ 2016-11-30T14:10:04Z

<?php

$d = [
    [
        'id'    => 1,
        'name'  => 'bir',
        'children'  => [
            [
                'id'    => 1001,
                'children'  => [
                    [
                        'id'    => 10011,
                        'parent_id' => 1001,
                        'name'  => 'onbinonbir',
                    ],
                    [
                        'id'    => 10012,
                        'parent_id' => 1001,
                        'name' => 'onbinoniki',
                    ]    
                ]
            ],
            [
                'id'    => 1002,
                'children'  => [
                    [
                        'id'    => 10021,
                        'parent_id' => 1002,
                        'name'  => 'onbinyirmibir',
                    ],
                    [
                        'id'    => 10022,
                        'parent_id' => 1002,
                        'name' => 'onbinyirmiiki',
                    ]    
                ]
            ]
        ]
    ],
    [
        'id'    => 2,
        'name'  => 'iki',
        'children'  => [
            [
                'id'    => 2001,
                'children'  => [
                    [
                        'id'    => 20011,
                        'parent_id' => 2001,
                        'name'  => 'yirmibinonbir',
                    ],
                    [
                        'id'    => 20012,
                        'parent_id' => 2001,
                        'name' => 'yirmibinoniki',
                    ]    
                ]
            ],
            [
                'id'    => 2002,
                'children'  => [
                    [
                        'id'    => 20021,
                        'parent_id' => 2002,
                        'name'  => 'yirmibinyirmibir',
                    ],
                    [
                        'id'    => 20022,
                        'parent_id' => 2002,
                        'name' => 'yirmibinyirmiiki',
                    ]    
                ]
            ]
        ]
    ]
];

$birinciler = array_column($d, 'id', 'id');
//var_dump($birinciler);
$ikinciler = array_column($d, 'children', 'id');
var_dump($ikinciler);
$ucunculer = array_column($ikinciler, 'children');
//var_dump($ikinciler);

Output for git.master, git.master_jit, rfc.property-hooks: array(2) { [1]=> array(2) { [0]=> array(2) { ["id"]=> int(1001) ["children"]=> array(2) { [0]=> array(3) { ["id"]=> int(10011) ["parent_id"]=> int(1001) ["name"]=> string(10) "onbinonbir" } [1]=> array(3) { ["id"]=> int(10012) ["parent_id"]=> int(1001) ["name"]=> string(10) "onbinoniki" } } } [1]=> array(2) { ["id"]=> int(1002) ["children"]=> array(2) { [0]=> array(3) { ["id"]=> int(10021) ["parent_id"]=> int(1002) ["name"]=> string(13) "onbinyirmibir" } [1]=> array(3) { ["id"]=> int(10022) ["parent_id"]=> int(1002) ["name"]=> string(13) "onbinyirmiiki" } } } } [2]=> array(2) { [0]=> array(2) { ["id"]=> int(2001) ["children"]=> array(2) { [0]=> array(3) { ["id"]=> int(20011) ["parent_id"]=> int(2001) ["name"]=> string(13) "yirmibinonbir" } [1]=> array(3) { ["id"]=> int(20012) ["parent_id"]=> int(2001) ["name"]=> string(13) "yirmibinoniki" } } } [1]=> array(2) { ["id"]=> int(2002) ["children"]=> array(2) { [0]=> array(3) { ["id"]=> int(20021) ["parent_id"]=> int(2002) ["name"]=> string(16) "yirmibinyirmibir" } [1]=> array(3) { ["id"]=> int(20022) ["parent_id"]=> int(2002) ["name"]=> string(16) "yirmibinyirmiiki" } } } } }

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2020-03-21 RFC: Is_Literal - declined
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2016-08-12 Object typehint - included in PHP 7.2
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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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