create array php without number specified

i'm trying to create array with php, it looks works, but i want to make the data inside array does not have specified number.

php code :

<?php

    $list = array("de73e0d5e8a567bb82f158c88a549b14", "94ce4f4928738ef54af52acd716704ee", "8628401848468301a6b0b19001cb08df");

    $list2 = array(2, 1, 3);

    $new = array();

    for ($i=0; $i < count($list); $i++) { 
        $new[$list2[$i] - 1] = $list[$i];
    }

    $encode = json_encode($new);

    print_r($encode);

?>

the result :

{
  "0": "94ce4f4928738ef54af52acd716704ee",
  "1": "de73e0d5e8a567bb82f158c88a549b14",
  "2": "8628401848468301a6b0b19001cb08df"
}

the result that i want :

[
  "94ce4f4928738ef54af52acd716704ee",
  "de73e0d5e8a567bb82f158c88a549b14",
  "8628401848468301a6b0b19001cb08df"
]

is it possible to make it the array into square bracket and not become braces, i success make the braces into square bracket by changing list2 variable into $list2 = array(1, 2, 3) but i need the code still into $list2 = array(2, 1, 3)