You can create a custom Smarty modifier, e.g. like this:
1. create a new Smarty modifier plugin -> "include/templater/plugins/modifier.mymodifier.php" with the following content:
PHP Code:
<?php
if (!defined('XCART_START')) { header("Location: ../../../"); die("Access denied"); }
function smarty_modifier_mymodifier($param) {
$param = explode(',', $param);
$param = isset($param[0]) ? $param[0] : $param;
return $param;
}
?>
2. add further use something like:
{$_meta_keywords|mymodifier}