Processing a form on the same page - php

Question

So, I've been messing with this for a day now and I've read a lot tutorials and even posts on stackoverflow. I know it's possible to have all your php form processing steps on the same page as your form, but for some reason, my form won't send an email. Any help?
<div id="mc_embed_signup">
<form method="post" action="index.php" enctype="text/plain" name="emailform">
<input type="text" name="name" placeholder="First Name or Alias"><br>
<input type="text" name="email" placeholder="Email Address"><br>
<textarea name="message" rows="10" size="50" placeholder="Placeholder Text."></textarea><br>
<input type="submit" value="Submit →" name="submit" class="button round">
</form>
<?php
$name = $_POST['name'];
$email = $_POST['email'];
$message = $_POST['message'];
$from = $_POST['email'];
$to = 'email#address.com'; //set to the default email address
$subject = 'Hello';
$body = "From: $name\n E-Mail: $email\n Message:\n $message";
$headers = "From: $email" . "\r\n" .
"Reply-To: $email" . "\r\n" .
"X-Mailer: PHP/" . phpversion();
if($_POST['submit']) {
mail ($to, $subject, $body, $headers); //mail sends it to the SMTP server side which sends the email
echo "<p>Your message has been sent!</p>";
}
else {
echo "<p>Something went wrong, go back and try again!</p>";
}
?>
</div>

Answer 1

Remove the enctype="text/plain" that's a main factor.
Plus, you also need to check if fields were left empty using (if)empty().
Not doing so, you may receive emails that either do not contain the user's email, name, message or a combination of all.
Assuming this file is called index.php if not, use action=""
<div id="mc_embed_signup">
<form method="post" action="index.php" name="emailform">
<input type="text" name="name" placeholder="First Name or Alias"><br>
<input type="text" name="email" placeholder="Email Address"><br>
<textarea name="message" rows="10" size="50" placeholder="Placeholder Text."></textarea><br>
<input type="submit" value="Submit →" name="submit" class="button round">
</form>
<?php
$name = $_POST['name'];
$email = $_POST['email'];
$message = $_POST['message'];
$from = $_POST['email'];
$to = 'email#example.com'; //set to the default email address
$subject = 'Hello';
$body = "From: $name\n E-Mail: $email\n Message:\n $message";
$headers = "From: $email" . "\r\n" .
"Reply-To: $email" . "\r\n" .
"X-Mailer: PHP/" . phpversion();
if(isset($_POST['submit']) && !empty($_POST['name']) && !empty($_POST['email']) && !empty($_POST['message']) ){
// check if mail was sent
if(mail ($to, $subject, $body, $headers)){ //mail sends it to the SMTP server side which sends the email
echo "<p>Your message has been sent!</p>";
}
else {
echo "<p>Mail was not sent. Check your logs.</p>";
}
}
else {
echo "<p>Something went wrong, go back and try again!</p>";
}
?>
</div>

Answer 2

This might help,
if(isset($_POST['submit'])) {
if(empty($_POST[name]) && empty($_POST[email]) && empty($_POST[message])){
echo 'Fields cannot be empty';
} else{
$name = $_POST['name'];
$to = $_POST['email'];
$subject = "Hello";
$message = $_POST['message'];
$from = $_POST['email'];
$body = "From: $name\n E-Mail: $email\n Message:\n $message";
mail ($to, $subject, $body);
}
}else{
echo "<p>Something went wrong, go back and try again!</p>";
}