PHP form with image upload - php

Question

I'm trying to make a simple contact form page with a combination of HTML and PHP with an upload image file section to it. I am 99% sure I got the HTML part correct but I am just lost with the PHP part.
So here is my HTML
<form class="" action="contactform.php" method="post">
<input type="text" name="firstname" placeholder="First Name" required>
<input type="text" name="lastname" placeholder="Last Name" required>
<input type="text" name="mail" placeholder="Your e-mail" required>
<input type="text" name="phone" placeholder="Phone">
<input type="file" id="myFile" name="filename">
<textarea name="message" placeholder="Message" required></textarea>
<button type="submit" name="submit">Send</button>
</form>
And here is my PHP
if (isset($_POST['submit'])) {
$firstname = $_POST['firstname'];
$lastname = $_POST['lastname'];
$phone = $_POST['phone'];
$mailFrom = $_POST['mail'];
$message = $_POST['message'];
$mailTo = "email#email.com";
$headers = "From: ".$mailFrom;
$subject = "You have received an e-mail from your web site";
$message = "First Name: " . $firstname . " Last Name: " . $lastname . "\r\nPhone: " . $phone . "\r\nemail: " . $mailFrom . "\r\nMessage: " . $message;
$retval = mail( $mailTo, $subject, $message, $headers );
if ( $retval == true ){
echo "<h1>Message Sent</h1>
<p>Thank you for contacting us your message has been sent successfully and we will get back to you a soon as possible.</p>";
}
else {
echo "<h1>Message Sent</h1><p>Message could not be sent Mail server did not accept mail.</p>";
}
}
Does anyone know how I can make the upload file part work?

Answer 1

try changing if($retval==true) to if($retval!=false) because I believe it only returns false if it fails and if it is successful it will return a hash value, so I believe making sure it's not true will work.
Also just you might want to take mail( $mailTo, $subject, $message, $headers ); and copy it into its own function, but I'm not sure. Kinda like this:
$retval = mail( $mailTo, $subject, $message, $headers );
mail( $mailTo, $subject, $message, $headers );
I'm not sure though, I hope this works, sorry if it doesn't!