<form class="defaultform" method="post" action="cijferinvoer.php" >
        <input id="reloadresults" type="submit" name="Loadresults" value="Laad de resultaten">

    </form>
    <?php
    if(isset($_POST['Loadresults'])){
        $sqlselect = "SELECT * FROM resultaat";
        $resultselect = $conn->query($sqlselect);
        echo '<table style="padding:10px">';
        echo '
            <tr >
                <td style="padding:6px;  border: 1px solid black;">ID: </td>
                <td style="padding:6px;  border: 1px solid black;">Tijdstip:</td>
                <td style="padding:6px;  border: 1px solid black;">Leerling id:</td>
                <td style="padding:6px;  border: 1px solid black;">Vak id:</td>
                <td style="padding:6px;  border: 1px solid black;">Cijfer:</td>
            </tr>';
        while($row = mysqli_fetch_array($resultselect, MYSQLI_BOTH)) {
        $temp = $row['tijdstip'];
        echo '
            <tr >
                <td style="padding:6px;  border: 1px solid black;"> ' . $row['id'] . '   </td>
                <td style="padding:6px;  border: 1px solid black;"> ' . $temp . '   </td>
                <td style="padding:6px;  border: 1px solid black;"> ' . $row['leerling_id'] . ' </td>
                <td style="padding:6px;  border: 1px solid black;"> ' . $row['vak_id'] . ' </td>
                <td style="padding:6px;  border: 1px solid black;"> ' . $row['cijfer'] . ' </td>
            </tr>';

        }
        echo '</table>';
    }
        ?>