php实现双色球算法

function DoubleBall(){
    $sysBlueball = mt_rand(1,16);
    $sysRedball = array(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33);
    $result = array();
    for($i=0; $i<6; $i++)
    {
        while(true)
        {
            $index = mt_rand(0,32);
            if($sysRedball[$index] != 0){
                $result[$i] = $sysRedball[$index];
                $sysRedball[$index] = 0;
                break;
           }
        }
 }
 $result = implode(',',$result);
 echo '你选择的篮球为：'.$sysBlueball.'';
 echo '你选择的红球为：'.$result.'';
}