Walker class not found error - php

Question

Hi I am using wordpress for the first time. I am trying to incorperated the walker class into my project which is located at
D:\wamp\www\SgsOnline\wp-content\themes\storefront\inc\functions\walker.php
I've included my class in my functions as
require get_template_directory() . '/inc/functions/walker.php';
And I am trying to call it in my header like :
function storefront_primary_navigation() {
?>
<nav id="site-navigation" class="main-navigation " role="navigation" aria-label="<?php esc_html_e( 'Primary Navigation', 'storefront' ); ?>">
<button class="menu-toggle" aria-controls="primary-navigation" aria-expanded="false"><?php echo esc_attr( apply_filters( 'storefront_menu_toggle_text', __( 'Navigation', 'storefront' ) ) ); ?></button>
<?php
wp_nav_menu(
array(
'theme_location' => 'primary',
'container_class' => 'primary-navigation',
'menu_class'=>'nav navbar-nav navbar-left nav-tabs',
'walker' => new Walker_Nav_Primary()
)
);
?>
</nav><!-- #site-navigation -->
<?php
}
But I am getting a error :
Fatal error: Class 'Walker_Nav_Primary' not found in
D:\wamp\www\SgsOnline\wp-content\themes\storefront\inc\structure\header.php
on line 65
This is oblivious wrong because it is looking in the wrong place for the class.
If anyone has any experience with this would be great
Regards
UPDATE
here is the class code
<?php
/* Collection of walker classes*/
class Walker_Nav_Primary extends Walker_Nav_menu {
function start_lvl( &$output, $depth){ //ul
$indent = str_repeat("\t", $depth );
$submenu = ($depth > 0) 'sub-menu' : ''; //Detect if the lvls is a submenu
$output .= "\n$indent<ul class=\"dropdown-menu$submenu depth_$depth\">\n";
}
/*
function end_lvl(){ // close ul
}
Not used at the moment
function start_el(){ // li, a, span
}
function end_el(){ // closing li, a, span
}
*/
}

Answer 1

At first glance it appears that file path is incorrect. / is unix directory separator but you need to use \ for Windows.
$path_elements = array(get_template_directory(), 'inc', 'functions', 'walker.php');
require join(DIRECTORY_SEPARATOR , $path_elements);
Walker_Nav_Primary has a syntax error in shorthand if-else statement (missing question mark after logical expression).
$submenu = ($depth > 0) ? 'sub-menu' : '';

Answer 2

I believe the issue is how you reference your walker...
'walker' => new Walker_Nav_Primary()
should just be...
'walker' => new Walker_Nav_Primary
no () needed.
If there was an issue with how you include your walker.php file that would error first as functions.php is run before your header.php.