Removing un-wanted commas in .csv file, after pressing 'submit button'

Question

here is the problem:

I have made a form field where people can enter their name and Adress etc.. When everything is filled and they Press send, i get the details in a .csv file. However my problem is, when a field i empty or all empty, all i get in the .csv file are ' ,,,, ' .

Here is my code:

<form method="POST" action="index.php">

    <input type="text" name="vorname"   placeholder="Vorname Eingeben">     <br>
    <input type="text" name="nachname"  placeholder="Nachname Eingeben">    <br>
    <input type="text" name="ort"       placeholder="Ort Eingeben">         <br>
    <input type="text" name="plz"       placeholder="PLZ Eingeben">         <br>
    <input type="text" name="strasse"   placeholder="Straße Eingeben">      <br>
                                                                            <br>
    <input type="submit" name='Absenden'>

</form>

PHP

$data = array (
    $_POST ['vorname'], $_POST ['nachname'], $_POST ['ort'], $_POST ['plz'], $_POST ['strasse']
);

$fp = fopen('file.csv', 'a+');
fputcsv($fp, $data);

fclose($fp);

Here is the .csv result's after the form is filled / not filled.

test1,test2,test3,test4,test5
,,,,
test3,test5,test6,test7,
test,,test,,

The; ,,,, Those are the ones that im trying to get rid of, or rather more when the form is not filled so they do not appear.

Answer 1

You can do the test before inserting any new line in your csv like this:

$data = array (
    $_POST ['vorname'], 
    $_POST ['nachname'], 
    $_POST ['ort'], 
    $_POST ['plz'], 
    $_POST ['strasse']
);

if(!empty(array_map('trim', array_filter($data)))) {
    $fp = fopen('file.csv', 'a+');

    fputcsv($fp, $data);

    fclose($fp);    
}