WordPress at a glance
function is not described

wp_ajax_untrash_post() WP 3.1.0

Ajax handler to restore a post from the trash.

No Hooks.

Return

Nothing (null).

Usage

wp_ajax_untrash_post( $action );
$action(string) (required)
Action to perform.

Code of wp ajax untrash post: wp-admin/includes/ajax-actions.php VER 5.0.3

<?php
function wp_ajax_untrash_post( $action ) {
	if ( empty( $action ) )
		$action = 'untrash-post';
	wp_ajax_trash_post( $action );
}