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@ 2024-05-05T11:05:33Z

<?php

$array = [
    [
        "id" => 2,
        "level" => 0,
        "email" => "bexcailimited1@gmail.com",
    ],
    [
        [
            "id" => 4,
            "level" => 1,
            "email" => "bexcailimited3@gmail.com",
        ],
        [
            [
                "id" => 5,
                "level" => 2,
                "email" => "bexcailimited4@gmail.com",
            ],
            [
                [
                    "id" => 6,
                    "level" => 3,
                    "email" => "bexcailimited5@gmail.com",
                ],
            ],
        ],
    ],
    [
        "id" => 3,
        "level" => 0,
        "email" => "bexcailimited2@gmail.com",
    ],
    [
        "id" => 7,
        "level" => 0,
        "email" => "bexcaitest@gmail.com",
    ],
    [
        [
            "id" => 8,
            "level" => 1,
            "email" => "Test012@gmail.com",
        ],
        [
            [
                "id" => 9,
                "level" => 2,
                "email" => "test03@gmail.com",
            ],
            [
                [
                    "id" => 10,
                    "level" => 3,
                    "email" => "test04@gmail.com",
                ],
                [
                    [
                        "id" => 11,
                        "level" => 4,
                        "email" => "test05@gmail.com",
                    ],
                    [
                        [
                            "id" => 12,
                            "level" => 5,
                            "email" => "test06@gmail.com",
                        ],
                    ],
                ],
            ],
        ],
    ],
];

function flattenList(array $array): array
{
    $result = [];
    foreach ($array as $row) {
        array_push($result, ...array_is_list($row) ? flattenList($row) : [$row]);
    }
    return $result;
}

$flatten2d = flattenlist($array);
usort($flatten2d, fn($a, $b) => $a['id'] <=> $b['id']);
var_export($flatten2d);

Output for 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' => 2, 'level' => 0, 'email' => 'bexcailimited1@gmail.com', ), 1 => array ( 'id' => 3, 'level' => 0, 'email' => 'bexcailimited2@gmail.com', ), 2 => array ( 'id' => 4, 'level' => 1, 'email' => 'bexcailimited3@gmail.com', ), 3 => array ( 'id' => 5, 'level' => 2, 'email' => 'bexcailimited4@gmail.com', ), 4 => array ( 'id' => 6, 'level' => 3, 'email' => 'bexcailimited5@gmail.com', ), 5 => array ( 'id' => 7, 'level' => 0, 'email' => 'bexcaitest@gmail.com', ), 6 => array ( 'id' => 8, 'level' => 1, 'email' => 'Test012@gmail.com', ), 7 => array ( 'id' => 9, 'level' => 2, 'email' => 'test03@gmail.com', ), 8 => array ( 'id' => 10, 'level' => 3, 'email' => 'test04@gmail.com', ), 9 => array ( 'id' => 11, 'level' => 4, 'email' => 'test05@gmail.com', ), 10 => array ( 'id' => 12, 'level' => 5, 'email' => 'test06@gmail.com', ), )

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