将Bootstrap下拉菜单类更改为WordPress子菜单类 _WordPress主题

我想更改为带有引导程序” dropdown-menu” 的wordpress自动生成的默认” 子菜单” 类, 以及具有引导程序” dropdown” 的” has-children” 自动生成的默认单词。我知道可以使用nav_Walker来实现。但我不知道该怎么做？
#1你有一个很好的kickstarter主题的例子：http://roots.io/ https://github.com/roots/roots/blob/master/lib/nav.php

< ?php /** * Cleaner walker for wp_nav_menu() * * Walker_Nav_Menu (WordPress default) example output: *< li id="menu-item-8" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-8"> < a href="http://www.srcmini.com/"> Home< /a> < /li> *< li id="menu-item-9" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-9"> < a href="http://www.srcmini.com/sample-page/"> Sample Page< /a> < /l * * Roots_Nav_Walker example output: *< li class="menu-home"> < a href="http://www.srcmini.com/"> Home< /a> < /li> *< li class="menu-sample-page"> < a href="http://www.srcmini.com/sample-page/"> Sample Page< /a> < /li> */ class Roots_Nav_Walker extends Walker_Nav_Menu { function check_current($classes) { return preg_match('/(current[-_])|active|dropdown/', $classes); }function start_lvl(& $output, $depth = 0, $args = array()) { $output .= "\n< ul class=\"dropdown-menu\"> \n"; }function start_el(& $output, $item, $depth = 0, $args = array(), $id = 0) { $item_html = ''; parent::start_el($item_html, $item, $depth, $args); if ($item-> is_dropdown & & ($depth === 0)) { $item_html = str_replace('< a', '< a class="dropdown-toggle" data-toggle="dropdown" data-target="#"', $item_html); $item_html = str_replace('< /a> ', ' < b class="caret"> < /b> < /a> ', $item_html); } elseif (stristr($item_html, 'li class="divider')) { $item_html = preg_replace('/< a[^> ]*> .*?< \/a> /iU', '', $item_html); } elseif (stristr($item_html, 'li class="dropdown-header')) { $item_html = preg_replace('/< a[^> ]*> (.*)< \/a> /iU', '$1', $item_html); }$item_html = apply_filters('roots/wp_nav_menu_item', $item_html); $output .= $item_html; }function display_element($element, & $children_elements, $max_depth, $depth = 0, $args, & $output) { $element-> is_dropdown = ((!empty($children_elements[$element-> ID]) & & (($depth + 1) < $max_depth || ($max_depth === 0)))); if ($element-> is_dropdown) { $element-> classes[] = 'dropdown'; }parent::display_element($element, $children_elements, $max_depth, $depth, $args, $output); } }/** * Remove the id="" on nav menu items * Return 'menu-slug' for nav menu classes */ function roots_nav_menu_css_class($classes, $item) { $slug = sanitize_title($item-> title); $classes = preg_replace('/(current(-menu-|[-_]page[-_])(item|parent|ancestor))/', 'active', $classes); $classes = preg_replace('/^((menu|page)[-_\w+]+)+/', '', $classes); $classes[] = 'menu-' . $slug; $classes = array_unique($classes); return array_filter($classes, 'is_element_empty'); } add_filter('nav_menu_css_class', 'roots_nav_menu_css_class', 10, 2); add_filter('nav_menu_item_id', '__return_null'); /** * Clean up wp_nav_menu_args * * Remove the container * Use Roots_Nav_Walker() by default */ function roots_nav_menu_args($args = '') { $roots_nav_menu_args['container'] = false; if (!$args['items_wrap']) { $roots_nav_menu_args['items_wrap'] = '< ul class="%2$s"> %3$s< /ul> '; }if (!$args['depth']) { $roots_nav_menu_args['depth'] = 2; }if (!$args['walker']) { $roots_nav_menu_args['walker'] = new Roots_Nav_Walker(); }return array_merge($args, $roots_nav_menu_args); } add_filter('wp_nav_menu_args', 'roots_nav_menu_args');

#2【将Bootstrap下拉菜单类更改为WordPress子菜单类】经过大量搜索和实验, 终于找到了它。我用twitter bootstrap nav walker解决了我的问题。
wp-bootstrap-navwalker