staylor / WordPress

	 * Triggered when the user tries adds a new header image from the

	 * Media Manager, even if s/he doesn't save that change.

	 */

	public function ajax_header_add() {

		check_ajax_referer( 'header-add', 'nonce' );

		if ( ! current_user_can( 'edit_theme_options' ) ) {

			wp_send_json_error();

		}

		$attachment_id = absint( $_POST['attachment_id'] );

		if ( $attachment_id < 1 ) {

			wp_send_json_error();

		}

		$key = '_wp_attachment_custom_header_last_used_' . get_stylesheet();

		update_post_meta( $attachment_id, $key, time() );

		update_post_meta( $attachment_id, '_wp_attachment_is_custom_header', get_stylesheet() );

		wp_send_json_success();

	}

	/**

	 * Given an attachment ID for a header image, unsets it as a user-uploaded

	 * Triggered when the user clicks the overlay "X" button next to each image

	 * choice in the Customizer's Header tool.

	 */

	public function ajax_header_remove() {

		check_ajax_referer( 'header-remove', 'nonce' );

		if ( ! current_user_can( 'edit_theme_options' ) ) {

			wp_send_json_error();

		}

		$attachment_id = absint( $_POST['attachment_id'] );

		if ( $attachment_id < 1 ) {

			wp_send_json_error();

		}

		$key = '_wp_attachment_custom_header_last_used_' . get_stylesheet();

		delete_post_meta( $attachment_id, $key );

		delete_post_meta( $attachment_id, '_wp_attachment_is_custom_header', get_stylesheet() );

		wp_send_json_success();

	}

	/**

	 *