伙计们！我有以下问题需要解决-我正在使用私有内容插件，它将用户划分为不同的类别。我需要显示作者所属类别的所有帖子。我尝试添加一个自定义查询，经过测试，该查询返回受影响的正确行数，但我无法让它显示数组的元素（我已声明全局$wpdb）：

if (!current_user_can(\'administrator\')) {

        //$groupcat is something like this string \'a:1:{i:0;s:2:\\"23\\";}\';
        $groupcat = $wpdb->get_results( "SELECT `categories` FROM 7NIaM6l_pc_users WHERE `wp_user_id` = 13", ARRAY_N);
    //Here I count the results and display them in the browser\'s console for check, which works fine
    $ac = count($groupcat);
    echo \'<script>console.log("count \' . $ac . \' ")</script>\';

//This part doesn\'t work.
echo \'<script>console.log("First element: \' . groupcat[0] . \' ")</script>\';