Create multiple shortcodes

I am creating a Wordpress Plugin that creates shortcodes. I want to load those shortcodes with an given name via my plugin.

like this [name]

But when I save my shortcode the shortcode is generated but not saved

What am I doing wrong.

This is my form

<form method="post" enctype="multipart/form-data">
<table>
    <tr>
        <td>
            Naam:
        </td>
        <td>
            <input name="naam" type="text" placeholder="Geef hier een unieke naam op" required/>
        </td>
    </tr>
    <tr>
        <td>
            Site URL:
        </td>
        <td>
            <input name="url" type="text" placeholder="Site URL" required/>
        </td>
    </tr>
    <tr>
        <td>
            Breedte:
        </td>
        <td>
            <input name="breedte" type="text" placeholder="Breedte in pixels" required/>
        </td>
    </tr>
    <tr>
        <td>
            Bevestig:
        </td>
        <td>
            <?php submit_button('Upload') ?>
        </td>
    </tr>
</table>
</form>

On post:

if(isset($_POST['naam'])) {
    $naam = $_POST['naam'];
    $url = $_POST['url'];
    $breedte = $_POST['breedte'];
    createShortcode($naam, $url, $breedte);
    add_shortcode($naam, 'createShortcode');
}

Create shortcode function

function createShortcode($naam, $url, $breedte){
    echo 'Naam: ' . $naam . ' ';
    echo 'URL: ' . $url . ' ';
    echo 'Breedte: ' . $breedte . ' ';
}

via Chebli Mohamed