public function add_help_tab( $id, $title ) { $current_screen = get_current_screen(); if ( null === $current_screen ) { return; } $current_screen->add_help_tab( [ 'id' => $this->pagehook . '-' . $id, 'title' => $title, 'content' => '', 'callback' => [ $this, 'help_content' ], ] ); }