unicode images file names

i have images uploaded from ftp to my site i want to integrate it to my media library , i find code to do though but problem is that my file names is in Arabic
when i use this code it convert all my names to ???
is there any way t do that right??
i used rawurlencode() for post_title and it is ok but in post_name no and generated images also named ???
this is the code

<?php

// $filename should be the path to a file in the upload directory.
$filename = '/path/to/uploads/2013/03/???-??????.jpg';
$name=rawurlencode(basename( $filename ));
// The ID of the post this attachment is for.
$parent_post_id = 37;

// Check the type of tile. We'll use this as the 'post_mime_type'.
$filetype = wp_check_filetype( basename( $filename ), null );

// Get the path to the upload directory.
$wp_upload_dir = wp_upload_dir();

// Prepare an array of post data for the attachment.
$attachment = array(
	'guid'           => $wp_upload_dir['url'] . '/' . basename( $filename ),
	'post_mime_type' => $filetype['type'],
	'post_title'     => $name,
	'post_content'   => '',
	'post_status'    => 'inherit'
);

// Insert the attachment.
$attach_id = wp_insert_attachment( $attachment, $filename, $parent_post_id );

// Make sure that this file is included, as wp_generate_attachment_metadata() depends on it.
require_once( ABSPATH . 'wp-admin/includes/image.php' );

// Generate the metadata for the attachment, and update the database record.
$attach_data = wp_generate_attachment_metadata( $attach_id, $filename );
wp_update_attachment_metadata( $attach_id, $attach_data );