register_sidebar / dynamic_sidebar with sidebar id
Your code works when I test it. I can only assume that the registration code is being hooked into the system too early or too late. register_sidebar() should be hooked on widgets_init per the Codex. Therefore: function register_header_sidebar_wpse_190618() { register_sidebar( array( ‘id’ => ‘header-sidebar’, ‘name’ => ‘Header’, ‘before_widget’ => ‘<div class=”widget”>’, ‘after_widget’ => ‘</div>’, ‘before_title’ … Read more