使用以下代码更改作者页面url以使用“昵称”。工作正常，但当昵称是多个单词时，它不会使其url友好。有什么办法吗？

add_filter( \'request\', \'wpse5742_request\' );
function wpse5742_request( $query_vars ) {
  if ( array_key_exists( \'author_name\', $query_vars ) ) {
    global $wpdb;
    $author_id = $wpdb->get_var( $wpdb->prepare( "SELECT user_id FROM {$wpdb->usermeta}    WHERE meta_key=\'nickname\' AND meta_value = %s", $query_vars[\'author_name\'] ) );
    if ( $author_id ) {
        $query_vars[\'author\'] = $author_id;
        unset( $query_vars[\'author_name\'] );    
    }
  } 
  return $query_vars; 
}

add_filter( \'author_link\', \'wpse5742_author_link\', 10, 3 );
function wpse5742_author_link( $link, $author_id, $author_nicename )  {
  $author_nickname = get_user_meta( $author_id, \'nickname\', true );
  if ( $author_nickname ) {
    $link = str_replace( $author_nicename, $author_nickname, $link );
  }
  return $link; 
}

add_action( \'user_profile_update_errors\', \'wpse5742_set_user_nicename_to_nickname\', 10, 3 );
function wpse5742_set_user_nicename_to_nickname( &$errors, $update, &$user ){
  if ( ! empty( $user->nickname ) ) {
    $user->user_nicename = sanitize_title( $user->nickname, $user->display_name );
  }
}