จะเก็บข้อมูลในลักษณะ array ลงในฐานข้อมูล MySQL ได้ยังไง

$sql = "SELECT * FROM `tracking_event` where id = 1127";
$qy = mysql_query($sql) or die (mysql_error());

$fs = mysql_fetch_array($qy);

$array["first_name"] = 'John';
$array["last_name"] = 'Smith';
$array["phone"] = '123456789';



$savetodb = serialize($array);
$toarray = unserialize($savetodb);
echo "<hr>";
echo $savetodb;
echo "<hr>";
echo "<pre>"; print_r($toarray); echo "</pre>";