file attachment issue to email?

My file is attached and sent with no error, but the attachment in my Inbox folder shows as follows:

// this is included in the email subject and body, so not correct file attach boundary="==Multipart_Boundary_xb46dc57fb3a58f8a859f39992cfd954ex" This is a multi-part message in MIME format. // this is included in the email subject and body, so not correct --==Multipart_Boundary_xb46dc57fb3a58f8a859f39992cfd954ex Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit // this is included in the email subject and body, so not correct test message

--==Multipart_Boundary_xb46dc57fb3a58f8a859f39992cfd954ex
Content-Type: image/jpeg;
name="23.jpg"
Content-Transfer-Encoding: base64

/9j/4AAQSkZJRgABAQEAYABgAAD/4QC8RXhpZgAASUkqAF4AAAAEABoBBQABAAAAPgAAABsBBQAB
AAAARgAAACgBAwABAAAAAgAAADEBAgAQAAAATgAAAAAAAABgAAAAAQAAAGAAAAABAAAAUGFpbnQu
TkVUIHYzLjA4AAUAGgEFAAEAAAA+AAAAGwEFAAEAAABGAAAAKAEDAAEAAAACAAAAMQECABAAAAB

My sendemail.php code is:

<?php

$headers= "MIME-Version: 1.0";
$headers= "Content-type: text/plain; charset=iso-8859-1";
$headers= "From: $_POST[name] <$_POST[email]>";
$headers= $_POST['name'];
$subject = $_POST['subject'];
$message = $_POST['message'];

/* GET File Variables */ 
            $tmpName = $_FILES['attachment']['tmp_name']; 
            $fileType = $_FILES['attachment']['type']; 
            $fileName = $_FILES['attachment']['name']; 

            if (file_exists($tmpName)) { 
              /* Reading file ('rb' = read binary)  */

              $file = fopen($tmpName,'rb'); 
              $data = fread($file,filesize($tmpName)); 
              fclose($file); 

              /* a boundary string */
              $randomVal = md5(time()); 
              $mimeBoundary = "==Multipart_Boundary_x{$randomVal}x"; 

              /* Header for File Attachment */
              $headers = "nMIME-Version: 1.0n"; 
              $headers = "Content-Type: multipart/mixed;n" ;
              $headers = " boundary="{$mimeBoundary}""; 

              /* Multipart Boundary above message */
              $message = "This is a multi-part message in MIME format.nn" . 
              "--{$mimeBoundary}n" . 
              "Content-Type: text/plain; charset="iso-8859-1"n" . 
              "Content-Transfer-Encoding: 7bitnn" . 
              $message . "nn"; 

              /* Encoding file data */
              $data = chunk_split(base64_encode($data)); 

              /* Adding attchment-file to message*/
              $message .= "--{$mimeBoundary}n" . 
              "Content-Type: {$fileType};n" . 
              " name="{$fileName}"n" . 
              "Content-Transfer-Encoding: base64nn" . 
              $data . "nn" . 
              "--{$mimeBoundary}--n"; 

            } 

            $to_user = "nur_Selam@yahoo.com";    

            $flgchk = mail($to_user, $subject, $message, $headers);     

            //require_once ('./includes/functions_mail.php');

                if ($flgchk) {

                echo "<META HTTP-EQUIV="refresh" CONTENT="2;url=forwardtoother.php?page=sender.html">";
                echo "Done, <br>";
                echo "Redirecting you to your <a href="?page=sender.html">Inbox</a>";
                }
                else
                {
                     echo "<META HTTP-EQUIV="refresh" CONTENT="2;url=forwardtoother.php?page=sender.html">";
                echo "Failed to send email, <br>";
                echo "Redirecting you to your <a href="?page=sender.html">Inbox</a>";
                }
            ?>

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