add a post with a attachment pro

$new_post = array('post_title' => $title,'post_content' => $content,'post_status' => 'pending','post_date' => date('Y-m-d H:i:s'),'post_author' => $user_ID,'post_type' => 'post','post_thumbnail' => $file,'post_category' => array(28,1));$post_id = wp_insert_post($new_post);$attachment = array('post_mime_type' => $wp_filetype['type'],'post_title' => preg_replace('/\.[^.]+$/', '', basename($filename)),'post_content' => '','post_status' => 'inherit');wp_insert_attachment($attachment);$wp_filetype = wp_check_filetype(basename($filename), null );$attachment = array('post_mime_type' => $wp_filetype['type'],'post_title' => preg_replace('/\.[^.]+$/', '', basename($filename)),'post_content' => '','post_status' => 'inherit');$attach_id = wp_insert_attachment( $attachment, $filename, $post_id );require_once(ABSPATH . "wp-admin" . '/includes/image.php');$attach_data = wp_generate_attachment_metadata( $attach_id, $filename );wp_update_attachment_metadata( $attach_id,  $attach_data );add_post_meta($post_id, '_thumbnail_id', $attach_id, true);