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@ 2019-10-05T12:06:37Z

<?php

function replaceParent(&$array, $parent = null) {
    foreach ($array as &$item) {
        if ($item['id'] == $parent) {
            if ($item['parent']) {
                return replaceParent($array, $item['parent']);
            } else {
                return $item['id'];
            }
        } elseif ($item['parent']) {
            $item['parent'] = replaceParent($array, $item['parent']);
        }
    }
}
$array = [
    '0' => [
        'id' => 1,
        'parent' => 0,
        'name' => 'root 0'
    ],
    '1' => [
        'id' => 2,
        'parent' => 1,
        'name' => 'root 1'
    ],
    '2' => [
        'id' => 3,
        'parent' => 2,
        'name' => 'root 2'
    ],
    '3' => [
        'id' => 4,
        'parent' => 3,
        'name' => 'root 3'
    ],
    '4' => [
        'id' => 5,
        'parent' => 3,
        'name' => 'root 4'
    ],
    '5' => [
        'id' => 6,
        'parent' => 2,
        'name' => 'root 2'
    ]
];

replaceParent($array);
var_export($array);

Output for 7.1.25 - 7.1.32, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12: array ( 0 => array ( 'id' => 1, 'parent' => 0, 'name' => 'root 0', ), 1 => array ( 'id' => 2, 'parent' => 1, 'name' => 'root 1', ), 2 => array ( 'id' => 3, 'parent' => 1, 'name' => 'root 2', ), 3 => array ( 'id' => 4, 'parent' => 1, 'name' => 'root 3', ), 4 => array ( 'id' => 5, 'parent' => 1, 'name' => 'root 4', ), 5 => array ( 'id' => 6, 'parent' => 1, 'name' => 'root 2', ), )

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