สอบถามตัวอย่าง code เก็บ ค่าที่เลือก จาก multiselect dropdown ลง database

Quote:

<select name="class" id="class" >
<option value=""> </option>
<option value="1" >1</option>
<option value="2" >2</option>
</select>

Quote:

<?
mysql_connect("localhost","user","password");
mysql_select_db("database");

if(trim($_POST["class"]) == "")
{
echo "Please input Class !";
exit();
}
{
mysql_query("SET NAMES UTF8");
$strSQL = "INSERT INTO table (class)

VALUES ('".$_POST["class"]."')";
$objQuery = mysql_query($strSQL);

echo "<center>Add Completed!<br></center>";

echo "<center><br> Go to <a href='./home.html'>Home page</a></center>";

}

mysql_close();
?>