Артур Шевченко

<?php
switch ($modx->event->name) {
    case 'OnDocFormRender':
        $_SESSION['tmp_res'] = $resource->toArray();
    case 'OnDocFormSave':
        if ($mode == 'upd') { // если изменяется родитель
            $resData = $resource->toArray();
            $result = [];
            foreach($resData as $k => $v){
                if($_SESSION['tmp_res'][$k] !== $v){
                    $result[$k] = $v;
                }
            }
           $_SESSION['tmp_res'] = $resData;
        }
    break;
}

$registry = $modx->getService('registry', 'registry.modRegistry');
$QM = $registry->getRegister('sendToPlatforms', 'registry.modDbRegister');
$branch = '/default/';
$QM->subscribe($branch);
$QM->send($branch, $data); // $data может быть стройкой или массивом.

$registry = $modx->getService('registry', 'registry.modRegistry');
$QM = $registry->getRegister('sendToPlatforms', 'registry.modDbRegister');
$branch = '/default/';
$QM->subscribe($this->branch);
$items = $QM->read([
            'poll_limit' => 1,
            'msg_limit' => 1000,
            'include_keys' => true,
            'remove_read' => true
        ]);

[[!pdoPage? 
    &element=`SimpleSearch`
    &includeTVs=`1`
    &ids=`[[msProducts?:default=`999999`?returnIds=`1`&limit=`0`&parents=`7`&sortby=`price`]]`
    &docFields=`pagetitle`
    &useAllWords=`1`    
    &limit=`10`
]]

<?php
define('MODX_API_MODE', true);
require_once dirname(__FILE__, 2) . '/index.php';