您好，我正在开发 WordPress 主题，但我不断收到致命错误消息：
Fatal error: Class 'wp_bootstrap_navwalker' not found in /Applications/XAMPP/xamppfiles/apps/wordpress/htdocs/wp-content/themes/wpbootstrap/header.php on line 35
有人可以帮我确定我需要在哪个文件中进行哪些更改吗？我一直在一步步关注youtube视频：https://www.youtube.com/watch?v=t-AGjdMrtdA https://www.youtube.com/watch?v=t-AGjdMrtdA
函数.php
<?php
// Register Nav Walker class_alias
require_once('wp_bootstrap_navwalker.php');
// Theme Support
function wpb_theme_setup(){
// Nav Menus
register_nav_menus(array(
'primary' => __('Primary Menu', 'wpbootstrap')
));
}
add_action('after_setup_theme','wpb_theme_setup');
header.php
<!DOCTYPE html>
<html <?php language_attributes(); ?>>
<head>
<meta charset="<?php bloginfo("charset"); ?>">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
<meta name="description" content="<?php bloginfo('description') ?>">
<title>
<?php bloginfo('name'); ?> |
<?php is_front_page() ? bloginfo('description') : wp_title(); ?>
</title>
<!-- Bootstrap core CSS -->
<link href="<?php bloginfo('template_url');?>/css/bootstrap.css" rel="stylesheet">
<!-- Custom styles for this template -->
<link href="<?php bloginfo('stylesheet_url');?>" rel="stylesheet">
<?php wp_head (); ?>
</head>
<body>
<div class="blog-masthead">
<div class="container">
<nav class="blog-nav">
<?php
wp_nav_menu( array(
'menu' => 'primary',
'theme_location' => 'primary',
'depth' => 2,
'container' => 'div',
'container_class' => 'collapse navbar-collapse',
'container_id' => 'bs-example-navbar-collapse-1',
'menu_class' => 'nav navbar-nav',
'fallback_cb' => 'WP_Bootstrap_Navwalker::fallback',
'walker' => new wp_bootstrap_navwalker())
);
?>
</nav>
</div>
</div>
<div class="container">
<div class="blog-header">
<h1 class="blog-title"><?php bloginfo('name'); ?></h1>
<p class="lead blog-description"><?php bloginfo('description'); ?></p>
</div>
wp-bootstrap-navwalker.php
<?php
/**
* WP Bootstrap Navwalker
*
* @package WP-Bootstrap-Navwalker
*/
/**
* Class Name: WP_Bootstrap_Navwalker
* Plugin Name: WP Bootstrap Navwalker
* Plugin URI: https://github.com/wp-bootstrap/wp-bootstrap-navwalker
* Description: A custom WordPress nav walker class to implement the Bootstrap 3 navigation style in a custom theme using the WordPress built in menu manager.
* Author: Edward McIntyre - @twittem, WP Bootstrap
* Version: 2.0.5
* Author URI: https://github.com/wp-bootstrap
* GitHub Plugin URI: https://github.com/wp-bootstrap/wp-bootstrap-navwalker
* GitHub Branch: master
* License: GPL-3.0+
* License URI: http://www.gnu.org/licenses/gpl-3.0.txt
*/
/* Check if Class Exists. */
if ( ! class_exists( 'WP_Bootstrap_Navwalker' ) ) {
/**
* WP_Bootstrap_Navwalker class.
*
* @extends Walker_Nav_Menu
*/
class WP_Bootstrap_Navwalker extends Walker_Nav_Menu {
/**
* Start Level.
*
* @see Walker::start_lvl()
* @since 3.0.0
*
* @access public
* @param mixed $output Passed by reference. Used to append additional content.
* @param int $depth (default: 0) Depth of page. Used for padding.
* @param array $args (default: array()) Arguments.
* @return void
*/
public function start_lvl( &$output, $depth = 0, $args = array() ) {
$indent = str_repeat( "\t", $depth );
$output .= "\n$indent<ul role=\"menu\" class=\" dropdown-menu\" >\n";
}
/**
* Start El.
*
* @see Walker::start_el()
* @since 3.0.0
*
* @access public
* @param mixed $output Passed by reference. Used to append additional content.
* @param mixed $item Menu item data object.
* @param int $depth (default: 0) Depth of menu item. Used for padding.
* @param array $args (default: array()) Arguments.
* @param int $id (default: 0) Menu item ID.
* @return void
*/
public function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
$indent = ( $depth ) ? str_repeat( "\t", $depth ) : '';
/**
* Dividers, Headers or Disabled
* =============================
* Determine whether the item is a Divider, Header, Disabled or regular
* menu item. To prevent errors we use the strcasecmp() function to so a
* comparison that is not case sensitive. The strcasecmp() function returns
* a 0 if the strings are equal.
*/
if ( 0 === strcasecmp( $item->attr_title, 'divider' ) && 1 === $depth ) {
$output .= $indent . '<li role="presentation" class="divider">';
} elseif ( 0 === strcasecmp( $item->title, 'divider' ) && 1 === $depth ) {
$output .= $indent . '<li role="presentation" class="divider">';
} elseif ( 0 === strcasecmp( $item->attr_title, 'dropdown-header' ) && 1 === $depth ) {
$output .= $indent . '<li role="presentation" class="dropdown-header">' . esc_attr( $item->title );
} elseif ( 0 === strcasecmp( $item->attr_title, 'disabled' ) ) {
$output .= $indent . '<li role="presentation" class="disabled"><a href="#">' . esc_attr( $item->title ) . '</a>';
} else {
$value = '';
$class_names = $value;
$classes = empty( $item->classes ) ? array() : (array) $item->classes;
$classes[] = 'menu-item-' . $item->ID;
$class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args ) );
if ( $args->has_children ) {
$class_names .= ' dropdown';
}
if ( in_array( 'current-menu-item', $classes, true ) ) {
$class_names .= ' active';
}
$class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : '';
$id = apply_filters( 'nav_menu_item_id', 'menu-item-' . $item->ID, $item, $args );
$id = $id ? ' id="' . esc_attr( $id ) . '"' : '';
$output .= $indent . '<li itemscope="itemscope" itemtype="https://www.schema.org/SiteNavigationElement"' . $id . $value . $class_names . '>';
$atts = array();
if ( empty( $item->attr_title ) ) {
$atts['title'] = ! empty( $item->title ) ? strip_tags( $item->title ) : '';
} else {
$atts['title'] = $item->attr_title;
}
$atts['target'] = ! empty( $item->target ) ? $item->target : '';
$atts['rel'] = ! empty( $item->xfn ) ? $item->xfn : '';
// If item has_children add atts to a.
if ( $args->has_children && 0 === $depth ) {
$atts['href'] = '#';
$atts['data-toggle'] = 'dropdown';
$atts['class'] = 'dropdown-toggle';
$atts['aria-haspopup'] = 'true';
} else {
$atts['href'] = ! empty( $item->url ) ? $item->url : '';
}
$atts = apply_filters( 'nav_menu_link_attributes', $atts, $item, $args );
$attributes = '';
foreach ( $atts as $attr => $value ) {
if ( ! empty( $value ) ) {
$value = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value );
$attributes .= ' ' . $attr . '="' . $value . '"';
}
}
$item_output = $args->before;
/*
* Glyphicons/Font-Awesome
* ===========
* Since the the menu item is NOT a Divider or Header we check the see
* if there is a value in the attr_title property. If the attr_title
* property is NOT null we apply it as the class name for the glyphicon.
*/
if ( ! empty( $item->attr_title ) ) {
$pos = strpos( esc_attr( $item->attr_title ), 'glyphicon' );
if ( false !== $pos ) {
$item_output .= '<a' . $attributes . '><span class="glyphicon ' . esc_attr( $item->attr_title ) . '" aria-hidden="true"></span> ';
} else {
$item_output .= '<a' . $attributes . '><i class="fa ' . esc_attr( $item->attr_title ) . '" aria-hidden="true"></i> ';
}
} else {
$item_output .= '<a' . $attributes . '>';
}
$item_output .= $args->link_before . apply_filters( 'the_title', $item->title, $item->ID ) . $args->link_after;
$item_output .= ( $args->has_children && 0 === $depth ) ? ' <span class="caret"></span></a>' : '</a>';
$item_output .= $args->after;
$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
} // End if().
}
/**
* Traverse elements to create list from elements.
*
* Display one element if the element doesn't have any children otherwise,
* display the element and its children. Will only traverse up to the max
* depth and no ignore elements under that depth.
*
* This method shouldn't be called directly, use the walk() method instead.
*
* @see Walker::start_el()
* @since 2.5.0
*
* @access public
* @param mixed $element Data object.
* @param mixed $children_elements List of elements to continue traversing.
* @param mixed $max_depth Max depth to traverse.
* @param mixed $depth Depth of current element.
* @param mixed $args Arguments.
* @param mixed $output Passed by reference. Used to append additional content.
* @return null Null on failure with no changes to parameters.
*/
public function display_element( $element, &$children_elements, $max_depth, $depth, $args, &$output ) {
if ( ! $element ) {
return; }
$id_field = $this->db_fields['id'];
// Display this element.
if ( is_object( $args[0] ) ) {
$args[0]->has_children = ! empty( $children_elements[ $element->$id_field ] ); }
parent::display_element( $element, $children_elements, $max_depth, $depth, $args, $output );
}
/**
* Menu Fallback
* =============
* If this function is assigned to the wp_nav_menu's fallback_cb variable
* and a menu has not been assigned to the theme location in the WordPress
* menu manager the function with display nothing to a non-logged in user,
* and will add a link to the WordPress menu manager if logged in as an admin.
*
* @param array $args passed from the wp_nav_menu function.
*/
public static function fallback( $args ) {
if ( current_user_can( 'edit_theme_options' ) ) {
/* Get Arguments. */
$container = $args['container'];
$container_id = $args['container_id'];
$container_class = $args['container_class'];
$menu_class = $args['menu_class'];
$menu_id = $args['menu_id'];
if ( $container ) {
echo '<' . esc_attr( $container );
if ( $container_id ) {
echo ' id="' . esc_attr( $container_id ) . '"';
}
if ( $container_class ) {
echo ' class="' . sanitize_html_class( $container_class ) . '"'; }
echo '>';
}
echo '<ul';
if ( $menu_id ) {
echo ' id="' . esc_attr( $menu_id ) . '"'; }
if ( $menu_class ) {
echo ' class="' . esc_attr( $menu_class ) . '"'; }
echo '>';
echo '<li><a href="' . esc_url( admin_url( 'nav-menus.php' ) ) . '" title="">' . esc_attr( 'Add a menu', '' ) . '</a></li>';
echo '</ul>';
if ( $container ) {
echo '</' . esc_attr( $container ) . '>'; }
}
}
}
} // End if().
