send email with attachment file

<form name="form1" enctype="multipart/form-data" method="post" action="">
<label>Your Name
<input type="text" name="name" />
</label>
<label>Your Email
<input type="email" name="email" />
</label>
<label>Attachment
<input type="file" name="my_file" />
</label>
<label>
<input type="submit" name="button" value="Submit" />
</label>
</form>
<?php
if($_POST && isset($_FILES['my_file']))
{

    $from_email = 'sender_mail@example.com'; //sender email
    $recipient_email = 'recipient_mail@example.com'; //recipient email
    $subject = 'Test mail'; //subject of email
    $message = 'This is body of the message'; //message body

    //get file details we need
    $file_tmp_name    = $_FILES['my_file']['tmp_name'];
    $file_name        = $_FILES['my_file']['name'];
    $file_size        = $_FILES['my_file']['size'];
    $file_type        = $_FILES['my_file']['type'];
    $file_error       = $_FILES['my_file']['error'];

    $user_email = filter_var($_POST["email"], FILTER_SANITIZE_EMAIL);

    if($file_error>0)
    {
        die('upload error');
    }
    //read from the uploaded file & base64_encode content for the mail
    $handle = fopen($file_tmp_name, "r");
    $content = fread($handle, $file_size);
    fclose($handle);
    $encoded_content = chunk_split(base64_encode($content));


        $boundary = md5("sanwebe");
        //header
        $headers = "MIME-Version: 1.0\r\n";
        $headers .= "From:".$from_email."\r\n";
        $headers .= "Reply-To: ".$user_email."" . "\r\n";
        $headers .= "Content-Type: multipart/mixed; boundary = $boundary\r\n\r\n";

        //plain text
        $body = "--$boundary\r\n";
        $body .= "Content-Type: text/plain; charset=ISO-8859-1\r\n";
        $body .= "Content-Transfer-Encoding: base64\r\n\r\n";
        $body .= chunk_split(base64_encode($message));

        //attachment
        $body .= "--$boundary\r\n";
        $body .="Content-Type: $file_type; name=\"$file_name\"\r\n";
        $body .="Content-Disposition: attachment; filename=\"$file_name\"\r\n";
        $body .="Content-Transfer-Encoding: base64\r\n";
        $body .="X-Attachment-Id: ".rand(1000,99999)."\r\n\r\n";
        $body .= $encoded_content;

    $sentMail = @mail($recipient_email, $subject, $body, $headers);
    if($sentMail) //output success or failure messages
    {
        die('Thank you for your email');
    }else{
        die('Could not send mail! Please check your PHP mail configuration.');
    }

}