PHP in bootstrap form not working - php

Question

I have been trying to add php to a bootstrap form via the following tutorial: https://bootstrapbay.com/blog/working-bootstrap-contact-form/. But nothing happens when I click the submit button - I just go back/stay to the same page with an empty form. I don't receive an email nor any error actions when I don't fill out some fields either. Below my code. The name of the document is werkwijze.php. Does someone have an idea what I'm doing wrong? Thanks a lot in advance!
<?php
if (isset($_POST['submit'])){
$voornaam = $_POST['voornaam'];
$familienaam = $_POST['familienaam'];
$email = $_POST['email'];
$tel = $_POST['tel'];
$vraag = $_POST['vraag'];
$from = 'info#tbep.be';
$to = 'eefje.vanhemelryck#gmail.com';
$subject = 'Vraag van op uw website www.tbep.be';
$body = "From: $voornaam $familienaam\n E-Mail: $email\n Telefoon: $tel\n Vraag: $vraag";
// Check if name has been entered
if (!$_POST['voornaam']) {
$errVoornaam = 'Gelieve uw voornaam op te geven';
}
if (!$_POST['familienaam']) {
$errFamilienaam = 'Gelieve uw familienaam op te geven';
}
// Check if email en phone has been entered and is valid
if (!$_POST['email'] || !filter_var($_POST['email'], FILTER_VALIDATE_EMAIL)) {
$errEmail = 'Gelieve uw emailadres op te geven';
}
if (!$_POST['tel']) {
$errTel = 'Gelieve uw telefoonnummer op te geven';
}
//Check if message has been entered
if (!$_POST['vraag']) {
$errVraag = 'Gelieve uw vraag te stellen';
}
// If there are no errors, send the email
if (!$errVoornaam && !$errFamilienaam && !$errEmail && !$errTel && !$errVraag) {
if (mail ($to, $subject, $body, $from)) {
$result='<div class="alert alert-success">Hartelijk dank. Ik neem zo snel mogelijk contact met u op!</div>';
} else {
$result='<div class="alert alert-danger">Sorry, er was een probleem met het versturen van dit formulier. Alternatief kan u ons een email sturen op info#tbep.be</div>';
}
}
}
?>
<form class="form-horizontal" role="form" action="werkwijze.php" method="post" enctype="text/plain">
<div class="form-group">
<label class="control-label col-sm-3" for="voornaam">Voornaam:</label>
<div class="col-sm-9">
<input type="text" class="form-control" id="voornaam" name="voornaam" placeholder="Voornaam">
<?php echo "<p class='text-danger'>$errVoornaam</p>";?>
</div>
</div>
<div class="form-group">
<label class="control-label col-sm-3" for="familienaam">Familienaam:</label>
<div class="col-sm-9">
<input type="text" class="form-control" id="familienaam" name="familienaam" placeholder="Familienaam">
<?php echo "<p class='text-danger'>$errFamilienaam</p>";?>
</div>
</div>
<div class="form-group">
<label class="control-label col-sm-3" for="email">Email:</label>
<div class="col-sm-9">
<input type="email" class="form-control" id="email" name="email" placeholder="Email">
<?php echo "<p class='text-danger'>$errEmail</p>";?>
</div>
</div>
<div class="form-group">
<label class="control-label col-sm-3" for="telefoon">Telefoonnummer:</label>
<div class="col-sm-9">
<input type="tel" class="form-control" id="tel" name="tel" placeholder="Telefoonnummer">
<?php echo "<p class='text-danger'>$errTel</p>";?>
</div>
</div>
<div class="form-group">
<label class="control-label col-sm-3" for="vraag">Uw vraag:</label>
<div class="col-sm-9">
<textarea class="form-control" rows="5" id="vraag" name="vraag" placeholder="Uw vraag"></textarea>
<?php echo "<p class='text-danger'>$errVraag</p>";?>
</div>
</div>
<div class="form-group">
<div class="col-sm-offset-3 col-sm-9">
<button type="submit" id="submit" name="submit" value="Send" class="btn btn-default">Versturen</button>
</div>
</div>
<div class="form-group">
<div class="col-sm-9 col-sm-offset-3">
<?php echo $result; ?>
</div>
</div>
</form>

Answer 1

Please Remove enctype="text/plain" from your form.
<form class="form-horizontal" role="form" action="werkwijze.php" method="post">
Or use
<form class="form-horizontal" role="form" action="werkwijze.php" method="post" enctype="multipart/form-data">