Володя

<?php

/** @var modX $modx */
/** @var array $scriptProperties */

$cacheKey = $modx->getOption('cacheKey', $scriptProperties, 'cache_key', true);
$cacheTime = $modx->getOption('cacheTime', $scriptProperties, 3600);

/** @var modCacheManager $cacheManager */
$cacheManager = $modx->getCacheManager();
if ($output = $cacheManager->get($cacheKey)) {
    return $output;
}

// если нет в кеше получаем $output и сохраняем в кеш

$cacheManager->set($cacheKey, $output, $cacheTime);

return $output;

{var $output= 'saveToCache'|snippet:[
    'element' => 'msProducts',
    'cacheKey' => 'cacheKey',
    'cacheTime' => 3600
    ....
]}
{$output}

$modx->switchContext('web');

case 'msOnGetProductPrice':
		if ($modx->context->key == 'mgr') {return;}

$discounts = [0];