通过id用户wordpress获取数据

I need to get user information by id but it does not work. What is the error? .

it shows nothing. if you can help me thanks

<?php
if(is_user_logged_in()) {
      global $wpdb;
    $current_user = wp_get_current_user();
    $results = $wpdb->get_results("SELECT postid FROM score WHERE ID={$current_user->ID}");
    echo $results[0]->postid;
} 
?>