PHP Mail Attachment showing noname.txt - php

Question

What's wrong in my code?
Mail sending fine and text also fine but the attachment showing like noname.txt
Please help.
$upload_name=$_FILES["resume"]["name"];
$upload_type=$_FILES["resume"]["type"];
$upload_size=$_FILES["resume"]["size"];
$upload_temp=$_FILES["resume"]["tmp_name"];
$file = $upload_temp;
$content = chunk_split(base64_encode(file_get_contents($file)));
$num = md5(uniqid(time()));
$email_to = "noname#example.com";
$email_subject = $name . " Applied for a job in website careers page";
$email_message = "<b>Form details below.</b><br />";
$email_message .= "<tr><td><strong>Last Name</strong> </td><td>".$name."</td></tr>";
$email_message .= "<tr><td><strong>Phone</strong> </td><td>".$phone."</td></tr>";
$headers .='Reply-To: '. $email_to . "\r\n" ;
$headers .= "MIME-Version: 1.0\r\n";
$headers .= "Content-Type: multipart/mixed; boundary=\"".$num."\"\r\n\r\n";
$headers .= "This is a multi-part message in MIME format.\r\n";
$headers .= "--".$num."\r\n";
$headers .= "Content-Type: text/html; charset=iso-8859-1\r\n";
$headers .= "Content-Transfer-Encoding: 8bit\r\n\r\n";
$headers .= $email_message."\r\n\r\n";
$headers .= "--".$num."\n";
$headers .= "Content-Type:".$upload_type."; name=\"".$upload_name."\"\r\n\r\n";
$headers .= "Content-Transfer-Encoding: base64\r\n";
$headers .= "Content-Disposition: attachment; filename=\"".$upload_name."\"\r\n\r\n";
$headers .= $content."\r\n\r\n";
$headers .= "--".$num."--";
if(#mail($email_to, $email_subject, "", $headers)){
echo "Mail Send";
}
else {
echo "Mail not sent.";
}
Please help. Thanks in advance.

Answer 1

Have you consider using PHPMailer? In my experience, saves yourself from a lot of these hassles.
Otherwise, try changing:
$headers .= "Content-Type:".$upload_type.";name=\"".$upload_name."\"\r\n\r\n";
To:
$headers .= "Content-Type: multipart/mixed; name=\"".$upload_name."\"\r\n\r\n";