What is the best way to randomize an array's order in PHP without using the shuffle() function?

function randomize_array_1($array_to_randomize) {
    $new_array = array();
    while (count($array_to_randomize) > 0) {
    	$rand_num = rand(0, count($array_to_randomize)-1);
    	$extracted = array_splice($array_to_randomize, $rand_num, 1);
    	$new_array[] = $extracted[0];
    }
    return $new_array;
}

function randomize_array_2($array_to_randomize) {
    usort($array_to_randomize, "rand_sort");
    return $array_to_randomize;
}
function rand_sort($a, $b) {
    return rand(-1, 1);
}

randomize_array_1:
    [2, 3, 1] => 166855
    [2, 1, 3] => 166692
    [1, 2, 3] => 166690
    [3, 1, 2] => 166396
    [3, 2, 1] => 166629
    [1, 3, 2] => 166738

randomize_array_2:
    [1, 3, 2] => 147781
    [3, 1, 2] => 73972
    [3, 2, 1] => 445004
    [1, 2, 3] => 259406
    [2, 3, 1] => 49222
    [2, 1, 3] => 24615

$keys = array_rand($myArray, count($myArray));
$newArray = array();

foreach ($keys as $key) {
$newArray[$key] = $myArray[$key];
}