Answered I'm stuck with $modx->query()

$packageName = 'myPackage';
$prefix = null;
$packagepath = $modx->getOption('core_path') . 'components/' . $packageName . '/';
$modelpath = $packagepath . 'model/';
if (is_dir($modelpath)) {
    $modx->addPackage($packageName, $modelpath, $prefix);
};

$myArr = array(11,22,33);
$classname = 'myXpdoClass';
$c = $modx->newQuery($classname);
$c->where(array("id:IN" => $myArr));
$c->prepare();
print $c->toSQL();

if ($collection = $modx->getCollection('$classname',$c)){
    print('BLISS');
} else {
    print('FAIL');
};

if ($collection = $modx->getCollection($classname,$c)){
    print('BLISS');
} else {
    print('FAIL');
};