Как заменить username на id

<?php
if ($modx->event->name != 'OnPageNotFound') return;

$users_page_id = $modx->getOption('users_page_id', $scriptProperties, '');
$redirect_to_username = $modx->getOption('redirect_to_username', $scriptProperties, 1);
$strict_urls = $modx->getOption('strict_urls', $scriptProperties, 1);

if ($page = $modx->getObject('modResource',intval($users_page_id))) {
    $req = $modx->context->getOption('request_param_alias', null, 'q');
    $url = $_REQUEST[$req];
    $cont_type = $modx->getObject('modContentType',array('name' => 'HTML'));
    $cont_ext = $cont_type->get('file_extensions');
    $cont_isfolder = $page->get('isfolder');
    $page_url = $modx->makeUrl(intval($users_page_id));
    $cont_suf = $modx->getOption('container_suffix', null, '/');
    $url_explode = explode($page_url, $url, 2);

    $position = strpos($url, $page_url);
    if ($position !== false && $position == 0 && count($url_explode) == 2) {
        if (!empty($cont_ext) && $cont_ext != '/') {
            $tmp = explode($cont_ext,$url_explode[1]);
            $url_explode[1] = $tmp[0];
        }
        if (substr($url_explode[1],-1) == '/') $url_explode[1] = substr($url_explode[1],0,-1);
        if (substr($url_explode[1],0,1) == '/') $url_explode[1] = substr($url_explode[1],1);
        

        if ($redirect_to_username && is_numeric($url_explode[1]) && $user = $modx->getObject('modUser', intval($url_explode[1]))) {
            if ($cont_isfolder == 1 && $cont_suf == "/") {
                $page_url = substr($page_url,0,-1);
            }
            $modx->sendRedirect($page_url.'/'.$user->get('username').$cont_type->get('file_extensions'));
        }
        
        if ($strict_urls) {
            $redirect = false;
            if (!empty($cont_ext)) {
                if ($cont_ext == '/' && substr($url,-1) != '/') $redirect = $url.$cont_ext;
                elseif (strpos($url, $cont_ext) === false) $redirect = $url.$cont_ext;
            }
            elseif (substr($url,-1) == '/') $redirect = substr($url,0,-1);
            if ($redirect) $modx->sendRedirect($redirect);
        }
        
        
        if ($user = $modx->getObject('modUser', array('username' => $url_explode[1]))) {
            $modx->setPlaceholders($user->Profile->toArray());
            $modx->setPlaceholders($user->toArray());
            $modx->sendForward($users_page_id);
        }
    }
}
return;