组合get_queried_object_id 获取当前用户ID和get_user_meta 要检索横幅，就应该这样做。

<?php
// somewhere in your theme\'s author.php

if ($img = get_user_meta(get_queried_object_id(), \'user_banner\', true)) {
   // they uploaded an image, use it
} else {
   // they did not upload the image, show the default
}