Sent email from unity with image attachment

UNITY

using System.Collections;
using UnityEngine.Networking;
using UnityEngine;

public class EmailController: MonoBehaviour
{
    public string email = "reciever@mail.com";
    public string screenShotURL = "https://www.your-domain.com/upload.php";

    void Start()
    {
       //sending email when start
        StartCoroutine(UploadPNG());
    }

    IEnumerator UploadPNG()
    {
        // We should only read the screen after all rendering is complete
        yield return new WaitForEndOfFrame();

        // Create a texture the size of the screen, RGB24 format
        int width = Screen.width;
        int height = Screen.height;
        var tex = new Texture2D(width, height, TextureFormat.RGB24, false);

        // Read screen contents into the texture
        tex.ReadPixels(new Rect(0, 0, width, height), 0, 0);
        tex.Apply();

        // Encode texture into PNG
        byte[] bytes = tex.EncodeToPNG();
        Destroy(tex);

        // Create a Web Form
        WWWForm form = new WWWForm();
        form.AddField("name", email);
        form.AddBinaryData("fileToUpload", bytes, "ScreenShot.png", "image/png");

        // Upload to a cgi script
        using (var w = UnityWebRequest.Post(screenShotURL, form))
        {
            yield return w.SendWebRequest();
            if (w.isNetworkError || w.isHttpError)
            {
                print(w.error);
            }
            else
            {
                print(w.uploadHandler);
            }
        }
    }
}




PHP

<?php
$target_dir = "uploads/";
$target_file = basename($_FILES["fileToUpload"]["name"]);
$nama = basename( $_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = strtolower(pathinfo($target_file,PATHINFO_EXTENSION));

$subject = "MAIL FROM UNITY";
$from = "sender@gmail.com";
$headers = "From: $from\r\n";
$headers .= "MIME-Version: 1.0\r\n"
  ."Content-Type: multipart/mixed; boundary=\"1a2a3a\"";

$message .= "If you can see this MIME than your client doesn't accept MIME types!\r\n"
  ."--1a2a3a\r\n";

$message .= "Content-Type: text/html; charset=\"iso-8859-1\"\r\n"
  ."Content-Transfer-Encoding: 7bit\r\n\r\n"
  ."Hey my <b>good</b> friend here is a picture of you"
  ."<p><span style='color:red'><b>PHOTO</b></span></p> \r\n"
  ."--1a2a3a\r\n";
 
 
// Check if image file is a actual image or fake image
if(isset($_POST["submit"])) {
    $check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
    if($check !== false) {
        // echo "File is an image - " . $check["mime"] . ".";
        $uploadOk = 1;
    } else {
        echo "File is not an image.";
        $uploadOk = 0;
    }
}

if ($uploadOk == 0) {
    echo "Sorry, your file was not uploaded.";
// if everything is ok, try to upload file
} else {
    if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {

$file = file_get_contents($nama);

$message .= "Content-Type: image/png; name=\"$nama\"\r\n"
  ."Content-Transfer-Encoding: base64\r\n"
  ."Content-disposition: attachment; file=\"$nama\"\r\n"
  ."\r\n"
  .chunk_split(base64_encode($file))
  ."--1a2a3a--";

// Send email

$success = mail($_POST["name"],$subject,$message,$headers);
   if (!$success) {
  echo "Mail to " . $_POST["name"] . " failed .";
   }else {
  echo "Success : Mail was send to " . $_POST["name"] ;
   }
    } else {
        echo "Sorry, there was an error uploading your file.";
    }
}
?>