nexusphp/public/delacctadmin.php

<?php
require "../include/bittorrent.php";
dbconn();
if (get_user_class() < UC_ADMINISTRATOR)
stderr("Error", "Permission denied.");

if ($_SERVER["REQUEST_METHOD"] == "POST")
{
$userid = trim($_POST["userid"]);

if (!$userid)
  stderr("Error", "Please fill out the form correctly.");

$res = sql_query("SELECT * FROM users WHERE id=" . sqlesc($userid)) or sqlerr();
if (mysql_num_rows($res) != 1)
  stderr("Error", "Bad user id or password. Please verify that all entered information is correct.");
$arr = mysql_fetch_assoc($res);

$id = $arr['id'];
$name = $arr['username'];
try {
    \Nexus\Database\NexusDB::transaction(function () use ($id) {
        $affectedRows = \Nexus\Database\NexusDB::table('users')->where('id', $id)->delete();
        if ($affectedRows != 1) {
            throw new \RuntimeException("Unable to delete the account.");
        }
        $tables = [
            'hit_and_runs' => 'uid',
            'claims' => 'uid',
            'exam_users' => 'uid',
            'exam_progress' => 'uid',
        ];
        foreach ($tables as $table => $key) {
            \Nexus\Database\NexusDB::table($table)->where($key, $id)->delete();
        }
    });
} catch (\Exception $exception) {
    stderr("Error", $exception->getMessage());
}
stderr("Success", "The account <b>".htmlspecialchars($name)."</b> was deleted.",false);
}
stdhead("Delete account");
?>
<h1>Delete account</h1>
<table border=1 cellspacing=0 cellpadding=5>
<form method=post action=delacctadmin.php>
<tr><td class=rowhead>User name</td><td><input size=40 name=userid></td></tr>

<tr><td colspan=2><input type=submit class=btn value='Delete'></td></tr>
</form>
</table>
<?php
stdfoot();