Return random numbers without duplicates

[Paradine]

I use this code to return random numbers without duplicates. I can't remember where I got it from but it isn't my code.

//returns an array of random keys between 2 numbers
function &UniqueRands($min, $max, $keys){
    static $returnme = array();
    while(in_array($x = rand($min,$max),$returnme));
    $returnme[] = $x;
    if($keys < count($returnme)-1 && $keys < ($max-$min))
        UniqueRands($min, $max, $keys);
    return $returnme;
} 

Usage:

 //usage
$rands = & UniqueRands(0, 15, 5);