请注意，post\\u Type查询变量未设置为标准类型（page、post和attachment，请参阅WP_QUery class file line 2396 on trac), 仅适用于自定义post类型，因此这是您可以针对每个类型进行测试的方式，

add_filter( \'posts_where\' , \'posts_where\', 10, 2);
function posts_where( $args, $wp_query_obj ) {
  $type = $wp_query_obj->query_vars[\'post_type\'];
  switch(true){
    case \'any\'==$type: //query any type (see codex for more details).
      break;
    case !empty($type) && is_array($type):
      //multiple post types define
      break;
    case !empty($type):
      //post type is a custom post.
      //this is where you would check for your post type,
      if ($type == \'property\') {
        $args .= \' AND latitude.meta_key="wp_gp_latitude" \';
        $args .= \' AND longitude.meta_key="wp_gp_longitude" \';
      }
      break;
    case $wp_query_obj->is_attachment():
      //post type is empty but is a media.
      $type=\'attachemnt\';
      break;
    case $wp_query_obj->is_page():
      //post type is empty but is a page.
      $type=\'page\';
      break;
    default:
      //post type is empty and not an attachment nor a page, so is a post.
      $type=\'post\';
      break;
  }
  return $where;
}

add_filter( \'posts_where\' , \'posts_where\', 10, 2);

function posts_where( $where, $query ) {
    global $wpdb,$wp_query;
    if ($query->query_vars[\'post_type\'] == \'property\') {
        $where .= \' AND latitude.meta_key="wp_gp_latitude" \';
        $where .= \' AND longitude.meta_key="wp_gp_longitude" \';
    }
    return $where;
}

以下是WP codex文档的链接add_filter 功能：http://codex.wordpress.org/Function_Reference/add_filter