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@ 2020-05-12T14:07:07Z

<?php
$structure = [
    "1" => [
        'id' => '1',
        'username' => 'username',
        'children' => [
            [
                'id' => '-1',
                'username' => 'NULL',
                'children' => [
                    [
                        'id' => '-1',
                        'username' => 'NULL',
                        'children' => [
                            [
                                'id' => '-1',
                                'username' => 'NULL',
                                'children' => [],
                            ],
                        ],
                    ],    
                ],
            ],
        ],
    ],
];

$entry = [
    157 => [
        'id' => '157',
        'username' => 'test1',
        'children' => [
            [
                'id' => '158',
                'username' => 'test1',
                'children' => [
                    [
                        'id' => '159',
                        'username' => 'test2',
                        'children' => [
                            [
                                'id' => '160',
                                'username' => 'test3',
                                'children' => [],
                            ],
                            [ 
                                'id' => '160',
                                'username' => 'KICK ME BECAUSE I M NOT EXIST IN FIRST ARRAY',
                                'children' => [],
                            ],
                        ],
                    ],
                ],
            ],
            [
                'id' => '160',
                'username' => 'KICK ME BECAUSE I M NOT EXIST IN FIRST ARRAY',
                'children' => [
                    [
                        'id' => '159',
                        'username' => 'KICK ME BECAUSE I M NOT EXIST IN FIRST ARRAY',
                        'children' => [
                            [
                                'id' => '161',
                                'username' => 'KICK ME BECAUSE I M NOT EXIST IN FIRST ARRAY',
                                'children' => [],
                            ],
                        ],
                    ],
                ],
            ],
        ],
    ],
];

function truncateRecursive($structure, $entry) {
    $output = [];
    while (($structureKey = key($structure)) !== null && ($entryKey = key($entry)) !== null) {
        $output[$entryKey] = !is_array($entry[$entryKey])
            ? $entry[$entryKey]
            : truncateRecursive($structure[$structureKey], $entry[$entryKey]);
        unset($structure[$structureKey], $entry[$entryKey]);    
    }
    return $output;
}

var_export(truncateRecursive($structure, $entry));

Output for 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 - 8.1.31, 8.2.0 - 8.2.27, 8.3.0 - 8.3.15, 8.4.1 - 8.4.2: array ( 157 => array ( 'id' => '157', 'username' => 'test1', 'children' => array ( 0 => array ( 'id' => '158', 'username' => 'test1', 'children' => array ( 0 => array ( 'id' => '159', 'username' => 'test2', 'children' => array ( 0 => array ( 'id' => '160', 'username' => 'test3', 'children' => array ( ), ), ), ), ), ), ), ), )

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137.35 ms | 409 KiB | 5 Q