<?php

use Illuminate\Support\Arr;

$array1 = [
    1, 2,
    [3, 4],
    [5],
    6, 7,
];

$array2 = [
    'one' => 1,
    'two' => 2,
    [
        'one' => 3,
        'four' => 4,
    ],
    'five' => 5,
];

$flatten1 = Arr::flatten($array1);
$flatten2 = Arr::flatten($array2);

dump($flatten1, $flatten2);


^ array:7 [

  0 => 1

  1 => 2

  2 => 3

  3 => 4

  4 => 5

  5 => 6

  6 => 7

]

^ array:5 [

  0 => 1

  1 => 2

  2 => 3

  3 => 4

  4 => 5

]

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PHP 8.0, Laminas MVC 3.2, Symfony 5.2, Laravel 8.28, PHPUnit 9.5, Doctrine ORM 2.8