Menu active class (wordpress)

Add a custom class to active menu item.

<?php
/**
 * Add a custom class to active menu item.
 */
add_filter('nav_menu_css_class', function($classes) {
    if (in_array('current-menu-item', $classes) || in_array('current-menu-parent', $classes) || in_array('current-menu-ancestor', $classes)) {
        $classes[] = 'active';
    }
    return $classes;
});
?>

functions.php

< toolbox