slug in der seitenübersicht

// Slug/URL in der Seitenübersicht anzeigen
function show_page_slug_column( $columns ) {
    $columns['slug'] = 'Slug/URL';
    return $columns;
}
add_filter( 'manage_pages_columns', 'show_page_slug_column' );


function show_page_slug_column_content( $column_name, $post_id ) {
    if ( 'slug' == $column_name ) {
        $post = get_post( $post_id );
        $slug = $post->post_name;
        echo '<a href="'.get_permalink( $post_id ).'">'.$slug.'</a>';
    }
}
add_action( 'manage_pages_custom_column', 'show_page_slug_column_content', 10, 2 );

add_filter( 'manage_pages_columns', 'wpse_add_slug_column' );
function wpse_add_slug_column( $columns ) {
  $columns['slug'] = 'Slug';
  return $columns;
}


add_action( 'manage_pages_custom_column', 'wpse_slug_column_content', 10, 2 );
function wpse_slug_column_content( $column_name, $post_id ) {
  if ( 'slug' == $column_name ) {
    echo get_post_field( 'post_name', $post_id );
  }
}