Email attachments that are uploaded from web form with SwiftMailer - php

Question

I am trying to use swftmailer to - upload a file (jpg,ppt,pdf,word etc with a max upload of eg: 6MB) from a form on a html web page, - email the content of the form with the attached file via swiftmailer.
My form is created & I am using $_POST to capture the field values in a thankyou.php page. The email is sending, but I cant get the file to attach!
The upload/attach file needs to be an option, I found a resource online that only sends the info if a file is uploaded, which is not always going to be the case, so I have turned to swiftmailer which looks great, but in the documentation/examples it specifies a path to upload the attachment too, I just want to be able to read in the file (not specify a path) and send it as an attachment to the given email address along with the other form fields, Name Email,Phone & Message.
Any help would be greatly appreciated.
My HTML (contact.html)
<div id="form-main">
<div id="form-div">
<form class="form" method="post" action="thank-you.php" enctype="multipart/form-data">
<p class="name">
<input name="fieldFormName" type="text" class="validate[required,custom[onlyLetter],length[0,100]] feedback-input" placeholder="Name" id="name" />
</p>
<p class="email">
<input name="fieldFormEmail" type="email" class="validate[required,custom[email]] feedback-input" id="email" placeholder="Email" />
</p>
<p class="phone">
<input name="fieldFormPhone" type="number" class="validate[required,custom[onlyLetter],length[0,20]] feedback-input" placeholder="Phone" id="phone" />
</p>
<p class="text">
<textarea name="fieldDescription" class="validate[required,length[6,300]] feedback-input" id="comment" placeholder="Comment"></textarea>
</p>
<p class="upload">
<small>Send us a Drawing or file</small>
<input name="fieldAttachment" id="attachment" class="feedback-input" type="file">
</p>
<div class="submit">
<input type="submit" value="SEND" id="button-blue"/>
<div class="ease"></div>
</div>
</form>
</div>
</div>
My PHP Code:
<?php
require_once 'lib/swift_required.php';
$fromEmail = $_POST['fieldFormEmail'];
$fromName = $_POST['fieldFormName'];
$fromPhone = $_POST['fieldFormPhone'];
$fromMessage = $_POST['fieldDescription'];
$fromAttachment = $_POST['fieldAttachment'];
// Create the mail transport configuration
$transport = Swift_MailTransport::newInstance();
// Create the message
$message = Swift_Message::newInstance();
$message->setTo(array(
"sender#domain.com" => "Sender Name"
));
$message->setSubject("This email is sent using Swift Mailer");
$message->setBody(
"From: " . $fromName . "\n" .
"Email: " . $fromEmail . "\n" .
"Phone: " . $fromPhone . "\n" .
"Message: " . $fromMessage . "\n"
);
$message->setFrom("$fromEmail", "$fromName");
// *** This is the part I am struggling to understand *** //
$message->attach(Swift_Attachment::newInstance('$fromAttachment'));
// Send the email
$mailer = Swift_Mailer::newInstance($transport);
$mailer->send($message);
?>
Thank you in advance

Answer 1

Replace your code
$message->attach(Swift_Attachment::newInstance('$fromAttachment'));
on this
$message->attach(
Swift_Attachment::fromPath($_FILES['fieldAttachment']['tmp_name'])->setFilename($_FILES['fieldAttachment']['name'])
);

Answer 2

I have taken DarveL's code and added an if statement to to check if a file is uploaded because I still want the email to send if the user does NOT attach a file.
The below code works, so now I just have to add some file type/size validation.
if(is_uploaded_file($_FILES['fieldAttachment']['tmp_name'])) {
$message->attach(
Swift_Attachment::fromPath($_FILES['fieldAttachment']
['tmp_name'])->setFilename($_FILES['fieldAttachment']['name'])
);
}

Answer 3

Check form upload. Maybe you have error in this.
<form enctype="multipart/form-data" action="" method="POST">