Custom_Background::handle_upload()

	public function handle_upload() {
		if ( empty($_FILES) )
			return;

		check_admin_referer('custom-background-upload', '_wpnonce-custom-background-upload');
		$overrides = array('test_form' => false);

		$uploaded_file = $_FILES['import'];
		$wp_filetype = wp_check_filetype_and_ext( $uploaded_file['tmp_name'], $uploaded_file['name'] );
		if ( ! wp_match_mime_types( 'image', $wp_filetype['type'] ) )
			wp_die( __( 'The uploaded file is not a valid image. Please try again.' ) );

		$file = wp_handle_upload($uploaded_file, $overrides);

		if ( isset($file['error']) )
			wp_die( $file['error'] );

		$url = $file['url'];
		$type = $file['type'];
		$file = $file['file'];
		$filename = basename($file);

		// Construct the object array
		$object = array(
			'post_title' => $filename,
			'post_content' => $url,
			'post_mime_type' => $type,
			'guid' => $url,
			'context' => 'custom-background'
		);

		// Save the data
		$id = wp_insert_attachment($object, $file);

		// Add the meta-data
		wp_update_attachment_metadata( $id, wp_generate_attachment_metadata( $id, $file ) );
		update_post_meta( $id, '_wp_attachment_is_custom_background', get_option('stylesheet' ) );

		set_theme_mod('background_image', esc_url_raw($url));

		$thumbnail = wp_get_attachment_image_src( $id, 'thumbnail' );
		set_theme_mod('background_image_thumb', esc_url_raw( $thumbnail[0] ) );

		/** This action is documented in wp-admin/custom-header.php */
		do_action( 'wp_create_file_in_uploads', $file, $id ); // For replication
		$this->updated = true;
	}