POST的唯一slug是由wp_unique_post_slug(). 查看返回的段塞的过滤源wp_unique_post_slug. 所以我们可以用我们自己的替换这个生成的slug。

您将在源代码中注意到，附件需要在所有类型中都具有唯一的slug，因此我们将只使用其中的代码。

您给出的示例似乎是非层次式的-并且不清楚您是否希望slug对于层次式帖子类型是唯一的（默认情况下，它只需要在树中是唯一的）-因此在下面的示例中，我忽略了层次式帖子类型。

add_filter(\'wp_unique_post_slug\', \'wpse72553_cross_type_unique_slugs\',10,5);
function wpse72553_cross_type_unique_slugs( $slug, $post_ID, $post_status, $post_type, $post_parent ){

      global $wpdb, $wp_rewrite;

     //Don\'t touch hierarchical post types
     $hierarchical_post_types = get_post_types( array(\'hierarchical\' => true) );
     if( in_array( $post_type, $hierarchical_post_types ) )
          return $slug;

     if( \'attachment\' == $post_type ){
         //These will be unique anyway
         return $slug;
     }


    $feeds = $wp_rewrite->feeds;
    if ( ! is_array( $feeds ) )
         $feeds = array();


     //Lets make sure the slug is really unique:
     $check_sql = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND ID != %d LIMIT 1";
     $post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_ID ) );

     if ( $post_name_check || in_array( $slug, $feeds) ) {
          $suffix = 2;

          do {
              $alt_post_name = substr ($slug, 0, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
              $post_name_check = $wpdb->get_var( $wpdb->prepare($check_sql, $alt_post_name, $post_ID ) );
              $suffix++;
          } while ( $post_name_check );

          $slug = $alt_post_name;
      }

    return $slug;
}