Filters (and actions) need to be declared with the number of arguments accepted by the callback; it is the fourth parameter of add_filter()
(default 1
):
add_filter( 'nav_menu_item_args', 'filter_nav_menu_item_args', 10, 3 );
function filter_nav_menu_item_args( $args, $item, $depth ) {
print_r( $item );
return $args;
}
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