ทำไมใช้คำสั่ง SELECT COUNT ตัวแปรที่เป็นอาเรย์ไม่ได้ครับ

$where_cause = " '$newlist[0][0]'='$newlist[0][1]' ";
$sql = "SELECT COUNT(mid) FROM $mid WHERE $where_cause;";
$query = mysql_query($sql);
$num = mysql_result($query, 0, 0);
echo "num is : ".$num;

$field = $newlist[0][0];
$player = $newlist[0][1];
$where_cause = " $field='$player' ";
$sql = "SELECT COUNT(mid) FROM $mid WHERE $where_cause;";
$query = mysql_query($sql);
$num = mysql_result($query, 0, 0);
echo "num is : ".$num;