addResourcesToDefaultResourceGroup.php

<?php
$tstart = microtime(true);
set_time_limit(0);

require 'config.core.php';
require MODX_CORE_PATH . 'model/modx/modx.class.php';

$modx = modX::getInstance();

$modx->initialize('mgr');

$modx->setLogLevel(modX::LOG_LEVEL_INFO);
$modx->setLogTarget('ECHO');

$resourceGroupName = "Default";

$modx->log(modX::LOG_LEVEL_INFO, "Adding all resources to resource group {$resourceGroupName}");
try {
    $iterator = $modx->getIterator('modResource');
    foreach ($iterator as $resource) {
        if (!$resource->isMember($resourceGroupName)) {
            $resource->joinGroup($resourceGroupName);
        }
    }
} catch (Exception $e) {
    $tend = microtime(true);
    $totalTime= sprintf("%2.4f seconds", ($tend - $tstart));
    $modx->log(modX::LOG_LEVEL_ERROR, "Failed adding resources to resource group {$resourceGroupName} in {$totalTime}: {$e->getMessage()}");
}

$tend = microtime(true);
$totalTime= sprintf("%2.4f seconds", ($tend - $tstart));

$modx->log(modX::LOG_LEVEL_INFO, "Added all resources to resource group {$resourceGroupName} in {$totalTime}");