shuffle

<?

$array = range(1, 20);

shuffle($array);

print_r($array);

?>

Array
(
    [0] => 16
    [1] => 5
    [2] => 9
    [3] => 17
    [4] => 12
    [5] => 13
    [6] => 14
    [7] => 10
    [8] => 4
    [9] => 20
    [10] => 1
    [11] => 3
    [12] => 7
    [13] => 15
    [14] => 18
    [15] => 2
    [16] => 11
    [17] => 8
    [18] => 19
    [19] => 6
)

<?

$array = range(1, 20);

$return = shuffle($array);

var_export($return);

?>

true