Klike

$template = $modx->resource->template;

<?php
if (empty($options) || $options == 0) return;
$price = preg_replace('/\s+/', '' , $input);
$old_price = preg_replace('/\s+/', '' , $options);
$discount = round(100 - ($price * 100 / $old_price) , 2);
return $discount;

{$price|discount:$old_price}

[[+old_price:gt=`0`:then=`[[+price:discount=`[[+old_price]]`]]`]]

<?php
$id = $modx->resource->id;
$query = $modx->newQuery('modTemplateVarResource', array(
    'tmplvarid' => 3, // ID TV поля
    'contentid' => $id,
));
$query->select('value');
$tv_value = $modx->getValue($query->prepare());
$tv =  $modx->fromJSON($tv_value);
return implode($tv, ', ');

{set $tv_name = ''|resource:'tv.tv_name' | fromJSON}
{$tv_name | join : ', '}

{set $tv_name = ''|resource:'tv.tv_name' | fromJSON}
<ul>
{foreach $tv_name as $tv}
	<li>{$tv}</li>
{/foreach}
</ul>

$query = $modx->newQuery('modTemplateVarResource', array(
    'tmplvarid' => 43, //ID TV поля
    'contentid' => 1, // ID ресурса
));
$query->select('value');
$tv_value = $modx->getValue($query->prepare());

$id = $modx->resource->id;
$query = $modx->newQuery('modTemplateVarResource', array(
    'tmplvarid' => 43, //ID TV поля
    'contentid' => $id, // ID ресурса
));
$query->select('value');
$tv_value = $modx->getValue($query->prepare());