Online PHP editor | output for 1YkvY

@ 2019-02-25T16:23:03Z

<?php

function treeify(array $input): array
{
    $result = [];
    $path = [];

    foreach ($input as &$entry) {
        $entry['children'] = [];

        $depth = $entry['depth'] - 1;
        $path = \array_slice($path, 0, $depth);
        $path[] = &$entry;

        0 === $depth
            ? $result[] = &$entry
            : $path[$depth - 1]['children'][] = &$entry;
    }

    return $result;
}

print_r(treeify([
    ['name' => 'Root_1', 'depth' => 1],
        ['name' => 'Children', 'depth' => 2],
        ['name' => 'Children', 'depth' => 2],
        ['name' => 'Children', 'depth' => 2],
            ['name' => 'Children', 'depth' => 3],
            ['name' => 'Children', 'depth' => 3],
            ['name' => 'Children', 'depth' => 3],
                ['name' => 'Children', 'depth' => 4],
        ['name' => 'Children', 'depth' => 2],
    ['name' => 'Root_2', 'depth'=> 1],
        ['name' => 'Children', 'depth' => 2],
        ['name' => 'Children', 'depth' => 2],
        ['name' => 'Children', 'depth' => 2],
            ['name' => 'Children', 'depth' => 3],
    ['name' => 'Root_3', 'depth' => 1],
    ['name' => 'Root_4', 'depth' => 1],
        ['name' => 'Children', 'depth' => 2],
]));

Output for 7.1.0 - 7.1.33, 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 - 8.1.29, 8.2.0 - 8.2.23, 8.3.0 - 8.3.11: Array ( [0] => Array ( [name] => Root_1 [depth] => 1 [children] => Array ( [0] => Array ( [name] => Children [depth] => 2 [children] => Array ( ) ) [1] => Array ( [name] => Children [depth] => 2 [children] => Array ( ) ) [2] => Array ( [name] => Children [depth] => 2 [children] => Array ( [0] => Array ( [name] => Children [depth] => 3 [children] => Array ( ) ) [1] => Array ( [name] => Children [depth] => 3 [children] => Array ( ) ) [2] => Array ( [name] => Children [depth] => 3 [children] => Array ( [0] => Array ( [name] => Children [depth] => 4 [children] => Array ( ) ) ) ) ) ) [3] => Array ( [name] => Children [depth] => 2 [children] => Array ( ) ) ) ) [1] => Array ( [name] => Root_2 [depth] => 1 [children] => Array ( [0] => Array ( [name] => Children [depth] => 2 [children] => Array ( ) ) [1] => Array ( [name] => Children [depth] => 2 [children] => Array ( ) ) [2] => Array ( [name] => Children [depth] => 2 [children] => Array ( [0] => Array ( [name] => Children [depth] => 3 [children] => Array ( ) ) ) ) ) ) [2] => Array ( [name] => Root_3 [depth] => 1 [children] => Array ( ) ) [3] => Array ( [name] => Root_4 [depth] => 1 [children] => Array ( [0] => Array ( [name] => Children [depth] => 2 [children] => Array ( ) ) ) ) )

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