So, what was messing up with the menu items setting was assignment operator on the decision structure (condition) instead of comparison (or equal) operator to add the items based on menu location. I don’t know how I missed or made that shameful kind of mistake.
Anyway, below is the working code template for WordPress menu editor in general that meets my needs. I had to replace menu argument with theme_location, menu wasn’t working for me (Don’t know why yet, and I doubt I have time to try to figure it out anyway).
add_filter('wp_nav_menu_items', 'register_header_footer_menu_items', 10, 2);
if (!function_exists('register_header_footer_menu_items')) {
function register_header_footer_menu_items($items, $args) {
if ( $args->theme_location == 'primary-menu' ) {
$items .= "\n" . "\t\t\t\t\t\t" . '<li><a href="#home">Home</a></li>' . "\n" .
"\t\t\t\t\t\t" . '<li><a href="#main">Who are We</a></li>' . "\n" .
"\t\t\t\t\t\t" . '<li><a href="#service">Services</a></li>' . "\n" .
"\t\t\t\t\t\t" . '<li><a href="#contact">Contacts</a></li>' . "\n";
return $items;
}
if ( $args->theme_location == 'secondary-menu' ) {
$items .= "\n" . "\t\t\t\t\t\t" . '<li><i class="fa fa-angle-right"></i><a href="#home">Home</a></li>' . "\n" .
"\t\t\t\t\t\t" . '<li><i class="fa fa-angle-right"></i><a href="#main">Who are We</a></li>' . "\n" .
"\t\t\t\t\t\t" . '<li><i class="fa fa-angle-right"></i><a href="#service">Services</a></li>' . "\n" .
"\t\t\t\t\t\t" . '<li><i class="fa fa-angle-right"></i><a href="#contact">Contacts</a></li>' . "\n";
return $items;
}
}
}