Insert Data in Database through pdo in php..

try {
 $db = new PDO('mysql:host=localhost;dbname=idegraphics', 'root', '');
 $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
 $db->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);

}catch(PDOException $e) {
echo 'ERROR: ' . $e->getMessage();
}

$radio=$_POST["radio1"];
$descr=$_POST["descr"];
$yrreg=$_POST["select"];
$carmodel=$_POST["mot"];
$fuel=$_POST["fuel"];
$variant=$_POST["variant"];

try {
    $stmt = $db->prepare("insert into motorscustomer(cardetails,registartiondetails,yearofregistation,cardetailsname,fueltype,variantype)
values(?,?,?,?,?,?)");
    $stmt->execute(array($radio,$descr,$yrreg,$carmodel,$fuel,$variant));
$last_id = $db->lastInsertId();
  //  echo "New record created successfully. Last inserted ID is: " . $last_id;
}catch(PDOException $e) {
    echo 'ERROR: ' . $e->getMessage();

}