tatianepires

<?php
// Add class to A element of .primary-menu
function tps_primary_menu_anchor_class($item_output, $item, $depth, $args) {
    $item_output = preg_replace('/<a /', '<a class="nav-link" ', $item_output, 1);
    return $item_output;
}
add_filter('walker_nav_menu_start_el', 'tps_primary_menu_anchor_class', 10, 4);

// Add class to LI element of .primary-menu
function tps_primary_menu_li_class($objects, $args) {