Un-repeated Random Variables

<?php
    function GetUnrepeatedRandomVariables($minIndex,$maxIndex)
    {
        $res = array();
 
        while(1)
        {
            if(count($res) == ($maxIndex-$minIndex+1))
                break;
            $rand = rand($minIndex, $maxIndex);
            if(!in_array($rand, $res))
                array_push ($res, $rand);
        }
        return $res;
    }
 
    $arr = GetUnrepeatedRandomVariables(0, 10);        
    print (count($arr) ."<br />");
    foreach ($arr as $val)
        print($val ."<br />");
?>