WordPress Dynamically create menu items from pages

function born_to_be_page() {
    if(get_page_by_title('Page Title') == NULL ) {
        parent_page('Page Title');
    }
    if(get_page_by_title('Page Child') == NULL ) {
        child_page('Page Child');
    }
}
add_action('init','born_to_be_page');

function parent_page($pageName) {
    $createParentPage = array(
        'post_title'    => $pageName,
        'post_content'  => 'Some Content',
        'post_status'   => 'publish',
        'post_type'     => 'page',
        'post_name'     => sanitize_title($pageName)
    );
    // Insert the post into the database
    $parentPage = wp_insert_post($createParentPage);

    wp_update_nav_menu_item(get_term_by('slug', 'primary', 'nav_menu' )->term_id, 0, [
        'menu-item-object-id' => $parentPage,
        'menu-item-type' => 'post_type',
        'menu-item-object' => 'page',
        'menu-item-status' => 'publish'
    ]);
}

function child_page($pageName) {
    $createChildPage = array(
        'post_title'    => $pageName,
        'post_content'  => 'Some Content',
        'post_status'   => 'publish',
        'post_author'   => 1,
        'post_type'     => 'page',
        'post_parent'   => 158,
        'post_name'     => sanitize_title($pageName)
    );
    // Insert the post into the database
    wp_insert_post($createChildPage);
}