多维数组。我究竟做错了什么？

I have a function:

我有一个功能：

function getDecision($num_players, $decisionType, $stage){

echo "in the function 1: ".$num_players."<br/>";
echo "in the function 2: ".$decisionType."<br/>";
echo "in the function 3: ".$stage."<br/>";

$x = mysql_query("

    SELECT `decisionValue` FROM `teamdecision` WHERE `decisionType` = '$decisionType' && `period`= '$stage'

    ")or die($x."<br/><br/>".mysql_error());

            $y = array();
            $i="0";
            while ($i<($num_players) && $row = mysql_fetch_assoc($x))
            {

            $y[$i] = $row['decisionValue'];
            $i++;

            }

            return ($y);
}
function getDeci