Mohon Bantuannya konversi coding php ke codeigniter di bawah ini :

session_start();
$query = mysql_query("select * from t_soal") or die (mysql_error());
//$_SESSION['soal'] = mysql_fetch_array($query);
$_SESSION['soal'] = array();
$_SESSION['no'] = 1;
$_SESSION['score'] = 0;
$_SESSION['option'] = array();
$_SESSION['jawab'] = array();
$i=0;
while($row = mysql_fetch_assoc($query)){
$_SESSION['soal'][] = $row;
$_SESSION['option'][] = array($_SESSION['soal'][$i]['a'], $_SESSION['soal'][$i]['b'], $_SESSION['soal'][$i]['c'], $_SESSION['soal'][$i]['d']);
$i++;
}
if(isset($_SESSION['soal'])){
header("location:test.php");
}