Вывод разницы данных на сайт средствами php - Joomla 3.x: Общие вопросы

<?php
defined('_JEXEC') or die;

class ModLatestCurrency {
	
	public static function getCurrency($params) {
		
		// Get a db connection.
		$db = JFactory::getDbo();

		// Create a new query object.
		$query = $db->getQuery(true);

		$query
			->select($db->quoteName(array('input1', 'input2', 'created_at', 'select1')))
			->from($db->quoteName('#__joomly_form'))		
			->where($db->quoteName('select1'). ' LIKE ' . $db->quote('store1'))
			->order($db->quoteName('created_at'). 'DESC limit 1');

		// Reset the query using our newly populated query object.
		$db->setQuery($query, 0, $params->get('num_currency'));

		// Load the results as a list of stdClass objects (see later for more options on retrieving data).
		$results = $db->loadObjectList();
		return (array) $results;
	} 
	
}

?>

<h1>store1</h1>
	<table>
		<tr>
			<th>Покупка</th>
			<th>Продажа</th>
		</tr>
		<tr>
			<td><?php foreach ($currency as $column) {
		echo $column->input1;} ?></td>
			<td><?php foreach ($currency as $column) {
		echo $column->input2;} ?></td>
		</tr>
	</table>

$prev_bay=$prev_sell=0;

echo $column->input1;

$color='greencolor';
$delta_bay=$column->input1-$prev_bay;
if($delta_bay<0) $color='redcolor';
echo " <span class='".$color."'>".$delta_bay."</span>";
$prev_bay=$column->input1;