There is no need to re-invent the wheel. Use the phpmailer class and then you can add attachments as simple as
function emailWithAttachment($to, $subject, $message, $attachment) {
$mail = new PHPMailer();
$mail->AddAddress($to);
$mail->From = "your@email.com";
$mail->FromName = "Your Name";
$mail->Subject = $subject;
$mail->Body = $message;
$mail->AddAttachment($attachment);
}
Here is your script, rewritten using phpmailer.class
<?php
if(isset($_POST['submit']))
{
//The form has been submitted, prep a nice thank you fullname
$output = '<h1>Thanks for your file and fullname!</h1>';
//Set the form flag to no display (cheap way!)
$flags = 'style="display:none;"';
// include and start phpmailer
require_once('PHPMailer_5.2.4/class.phpmailer.php');
$mail = new PHPMailer();
//Deal with the email
$mail->From = "webmaster@example.com"; // from
$mail->AddReplyTo("webmaster@example.com", "Webmaster"); // reply to address/name
$mail->AddAddress('email@address.here'); // to address
$mail->Subject = 'A file for you'; // subject
$mail->Body = $fullname; // body
$mail->AddAttachment($_FILES['file']['tmp_name']); // attach uploaded file
}
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>MailFile</title>
</head>
<body>
<?php echo $output; ?>
<form enctype="multipart/form-data" action="<?php echo $_SERVER['PHP_SELF'];?>" method="post" <?php echo $flags;?>>
<p><label for="fullname">Full name</label> <input name="fullname" id="fullname" /></p>
<p><label for="file">File</label> <input type="file" name="file" id="file"></p>
<p><input type="submit" name="submit" id="submit" value="send"></p>
</form>
</body>
</html>
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