How do I add an email attachment to this mail script?

This email script sends text perfectly.  I need to add an attachment (XLS file) to this email script.  How do I accomplish?

I have tried several scripts such as PHPmailer on  and cannot get them to work.  

If you can suggest something easy that works...  

(Attachment is in the same directory as script)

$filename = 'backorders_2015-03-17.xls';

$to      = $receiver;
$subject = $filename;
$message = 'backorders from today';
$message = str_replace("\n.", "\n..", $message);
$headers = 'From: $myemail' . "\r\n" .
    'Reply-To: $myemail' . "\r\n" .
    'X-Mailer: PHP/' . phpversion();

mail($to, $subject, $message, $headers);

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Marcus BointonCommented:
Really, go back to PHPMailer and base your code on one of the examples provided - even the one in the readme will do what you ask. Building messages like this from scratch is far, far more complicated than using a library to do it for you.

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lawrence_devAuthor Commented:
Thanks for your help!  I went back to the folder and found a sample file and was able to get it to work...  Pretty easy!
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