Select uitvragen d.m.v. $_POST

<form  method="post" name="toevoegform" id="toevoegform">
<table>
<tr>
<td width="100">OrderID*:</td>
<td><input type="text" name="orderid" id="orderid" size="3" placeholder="" required></td>
</tr>

<tr>
<td>
Contactwijze: </td><td><select name="contactwijze" id="contactwijze">
      <option value="1">Telefonisch</option>
      <option value="2">E-mail</option>
      <option value="3">SMS</option>
      <option value="4">Whatsapp</option>
      <option value="5">Voicemail</option>
</select>

</td>
</tr>


<tr>
<td>Opmerkingen: </td>
<td><textarea name="comment">Enter text here...</textarea></td>
</tr>
</tr>
</table>
<center><input type="submit" value="Go" name="submit"/></center>
</form>

<?php
    
if(isset($_POST['submit'])) {

/* hier horen persoonlijke gegevens te staan */

try {
    $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
    // set the PDO error mode to exception
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);


    // prepare sql and bind parameters
    $stmt = $conn->prepare("INSERT INTO prj_contact (OrderID, Datum, Wijze, Opmerkingen)
    VALUES (:OrderID, :Datum, :Wijze, :Opmerkingen)");
    $stmt->bindParam(':OrderID', $orderid);
    $stmt->bindParam(':Datum', $datum);
    $stmt->bindParam(':Wijze', $wijze);
    $stmt->bindParam(':Opmerkingen', $opmerkingen);

    // insert a row
    $orderid = $_POST['orderid'];
    $datum = 1;
    $wijze = $_POST['contactwijze'];
    $opmerkingen = $_POST['comment'];
    $stmt->execute();

    echo '<javascript language="Javascript">alert("Nieuwe record toegevoegd")</script>;';
    header('Location: index.php');
    }
catch(PDOException $e)
    {
    echo "Error: " . $e->getMessage();
    }
$conn = null;
}

?>