display a message after submit and refresh - php

Question

i'm trying to get a message to appear after my form has been submitted, i can get the form to submit and the page to then refresh but unsure how to add the message after the refresh.
i have no knowledge of PHP so sorry is its and obvious answer
thanks
my html & PHP if needed
<form action="action.php" method="POST" target="my_iframe" onsubmit="setTimeout(function(){window.location.reload();},10);">
<input type="text" id="name" name="name" placeholder="name" required="required">
<input type="email" id="email" name="email" placeholder="email" required="required">
<input type="tel" id="phone" name="phone" placeholder="phone">
<div class="form-row" style="display:none;"><input type="hidden" name="url" placeholder="URL"></div>
<textarea id="message" name="message" placeholder="message" style="height:200px" required="required"></textarea>
<input id="submit" type="submit" value="submit">
</form>
<iframe name="my_iframe" width="1" height="1" style="border:none"></iframe>
<?php
$to = 'zoeharrisondesign#gmail.com';
$subject = 'New Message Recieved!';
$from = $_POST['email'];
$phone = $_POST['phone'];
$message = $_POST['message'];
$name = $_POST['name'];
//check honeypot
if( !empty( $honeypot ) ) {
echo 'There was a problem';
}
// To send HTML mail, the Content-type header must be set
$headers = 'MIME-Version: 1.0' . "\r\n";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
// Create email headers
$headers .= 'From: '.$from."\r\n".
'Reply-To: '.$from."\r\n" .
'X-Mailer: PHP/' . phpversion();
// Compose a simple HTML email message
$message = "$message \r\n |
From $name \r\n |
Tel: $phone";
// Sending email
if(mail($to, $subject, $message, $headers)){
echo 'Your message has been sent successfully.';
} else{
echo 'Unable to send email. Please try again.';
}
?>

Answer 1

Update your php sending email to this
if (mail($myEmail, $subject, $message)){
$success = "Message sent successful";
}else{
$success = "Message Sending Failed.";
}
Then add this php codes in your html codes add this code to display a message. Put it on top of your form html tag.
<?php
if (isset($success)){ echo "<div>" . $success . "</div>";}
?>
You may even add some styling on the message if you prefer.