array_unique后，数组本身的值并不会变

<?php
$arr = [
    '111',    '111',    '111',    '111',    '111',    '111',    '111',    '111',    '111'
       ];
print_r($arr);
print_r(array_unique($arr));
print_r($arr);　　　　　　　　//array_unique后，数组本身的值并不会变




?>

Array
(
    [0] => 111
    [1] => 111
    [2] => 111
    [3] => 111
    [4] => 111
    [5] => 111
    [6] => 111
    [7] => 111
    [8] => 111
)
Array
(
    [0] => 111
)
Array
(
    [0] => 111
    [1] => 111
    [2] => 111
    [3] => 111
    [4] => 111
    [5] => 111
    [6] => 111
    [7] => 111
    [8] => 111
)