问题
Hello I am working on a Wordpress theme and I continue to get a fatal error message:
Fatal error: Class 'wp_bootstrap_navwalker' not found in /Applications/XAMPP/xamppfiles/apps/wordpress/htdocs/wp-content/themes/wpbootstrap/header.php on line 35
Can someone please help me identify what changes I need to make in which file? I have been following a youtube video step by step: https://www.youtube.com/watch?v=t-AGjdMrtdA
Function.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().
回答1:
The next step is to create the WP_Bootstrap_Navwalker.php and include it. Put the following line into functions.php: file require_once(get_template_directory() . "/inc/wp-bootstrap-navwalker.php");
This assumes that the file is in an /inc folder. If the site now runs without error, the final step is to add the 'walker' => new WP_Bootstrap_Navwalker() line to the wp_nav_menu call.
More info: https://github.com/wp-bootstrap/wp-bootstrap-navwalker
Try to update your code here:
<?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()
));
?>
I hope it will be helpful for you
回答2:
There is no problem in the code.
Actually, you have done the mistake while saving the functions.php. The mistake is instead of "functions.php" you have saved it as "function.php". This is why the fatal error is appearing.
来源：https://stackoverflow.com/questions/45445283/fatal-error-class-wp-bootstrap-navwalker-not-found-in