WordPress Custom Walker Menu - Keep custom classes only - wordpress

Question

I'm using WordPress 4.2.1 and I created a custom walker for wp_nav_menu()
In the method start_el() I get the element classes with the following:
function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
...
$classes = empty( $item->classes ) ? array() : ( array ) $item->classes;
...
}
Is there a way to get custom class(es) "only"? (Admin/Appearance/Menus -> CSS Classes)
Someone can help?
Thank you

Answer 1

You could write a function to filter out the wordpress classes...
function item_class(Array $item_class)
{
$cls = array_filter($item_class, function($value) {
return (str_replace(['menu-', 'page_', 'page-'], '', $value) != $value) ? false : true;
});
return implode(' ', $cls);
}
Add to yr walker class, then call with a menu item. eg:
echo '<a class="' . $this->item_class($item->classes) . '">';

Answer 2

No there is no method to get all custom classes in wordpress. But you can use 2 version of wordpress and origional theme and modifty theme and then compare it using software such as codecompare ,Diff Checker or Win Merge.

Answer 3

you can add your classes into walker class like this .
class Description_Walker extends Walker_Nav_Menu
{
/**
* Start the element output.
*
* #param string $output Passed by reference. Used to append additional content.
* #param object $item Menu item data object.
* #param int $depth Depth of menu item. May be used for padding.
* #param array $args Additional strings.
* #return void
*/
function start_lvl( &$output, $depth = 0, $args = array() ) {
// depth dependent classes
$indent = ( $depth > 0 ? str_repeat( "\t", $depth ) : '' ); // code indent
$display_depth = ( $depth + 1); // because it counts the first submenu as 0
$classes = array(
'nav-submenu',
( $display_depth % 2 ? 'menu-odd' : 'menu-even' ),
( $display_depth >=2 ? 'sub-sub-menu' : '' ),
'menu-depth-' . $display_depth
);
$class_names = implode( ' ', $classes );
// build html
$output .= "\n" . $indent . '<ul class="' . $class_names . '">' . "\n";
}
function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
global $wp_query;
$indent = ( $depth > 0 ? str_repeat( "\t", $depth ) : '' ); // code indent
// depth dependent classes
$depth_classes = array(
( $depth == 0 ? 'nav-item' : 'nav-submenu-item' ),
( $depth >=2 ? 'sub-sub-menu-item' : '' ),
( $depth % 2 ? 'menu-item-odd' : 'menu-item-even' ),
'menu-item-depth-' . $depth
);
$depth_class_names = esc_attr( implode( ' ', $depth_classes ) );
// passed classes
$classes = empty( $item->classes ) ? array() : (array) $item->classes;
$class_names = esc_attr( implode( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item ) ) );
// build html
$output .= $indent . '<li id="nav-menu-item-'. $item->ID . '" class="' . $depth_class_names . ' ' . $class_names . '">';
// link attributes
$attributes = ! empty( $item->attr_title ) ? ' title="' . esc_attr( $item->attr_title ) .'"' : '';
$attributes .= ! empty( $item->target ) ? ' target="' . esc_attr( $item->target ) .'"' : '';
$attributes .= ! empty( $item->xfn ) ? ' rel="' . esc_attr( $item->xfn ) .'"' : '';
$attributes .= ! empty( $item->url ) ? ' href="' . esc_attr( $item->url ) .'"' : '';
$attributes .= ' class="menu-link ' . ( $depth > 0 ? 'sub-menu-link' : 'main-menu-link' ) . '"';
$item_output = sprintf( '%1$s<a%2$s>%3$s%4$s%5$s</a>%6$s',
$args->before,
$attributes,
$args->link_before,
apply_filters( 'the_title', $item->title, $item->ID ),
$args->link_after,
$args->after
);
// build html
$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
}
}