View difference between Paste ID: vZtpMp7r and cE7h0K32

 add_filter( 'wp_nav_menu_items', 'add_logo_nav_menu', 10, 2 );
 function add_logo_nav_menu($items, $args){
 $newitems = '<li><a title="logo" href="#">LOGO</a></li>';
     $newitems .= $items;
 return $newitems;
 }