从php中的数组中删除重复项

$arr = array(1, 2, 3, 4, 5, 2, 6, 7, 8, 1);
$result = array_unique($arr);
print_r($result);

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