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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);

var_dump: documentation ( source)
array_column: documentation ( source)

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