Just in case-active submenu items

CustomHelpers.php

<?php

/**
 *
 * Set active css class if the specific URI is current URI by fragments.
 *
 * @param string $path          A specific URI
 * @param string $class_name    Css class name, optional
 * @return string               Css class name if it's current URI,
 *                              otherwise - empty string
 */
function setActiveBySegments(string $path, string $class_name = "is-active")
{
    $request_path = implode('/', Request::segments());
    
    return $request_path === $path ? $class_name : "";
}