输出多数组php (laravel)

$array1 = [1, 2, 3];
$array2 = [4, 5, 6];
$array3 = [7, 8, 9];

// 使用array_merge()函数合并数组
$result1 = array_merge($array1, $array2, $array3);
print_r($result1);

// 使用Laravel的Collection类合并数组
$collection1 = collect($array1);
$collection2 = collect($array2);
$collection3 = collect($array3);

$result2 = $collection1->merge($collection2)->merge($collection3)->all();
print_r($result2);

Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
    [5] => 6
    [6] => 7
    [7] => 8
    [8] => 9
)