misuzu/public/manage/general/setting-delete.php

<?php
namespace Misuzu;

use Misuzu\Config\CfgTools;
use Misuzu\Users\User;

require_once '../../../misuzu.php';

if(!User::hasCurrent()
    || !perms_check_user(MSZ_PERMS_GENERAL, User::getCurrent()->getId(), MSZ_PERM_GENERAL_MANAGE_CONFIG)) {
    echo render_error(403);
    return;
}

$valueName = (string)filter_input(INPUT_GET, 'name');
$valueInfo = $cfg->getValueInfo($valueName);
if($valueInfo === null) {
    echo render_error(404);
    return;
}

if($_SERVER['REQUEST_METHOD'] === 'POST' && CSRF::validateRequest()) {
    $valueName = $valueInfo->getName();
    $msz->createAuditLog('CONFIG_DELETE', [$valueName]);
    $cfg->removeValues($valueName);
    url_redirect('manage-general-settings');
    return;
}

Template::render('manage.general.setting-delete', [
    'config_value' => $valueInfo,
]);