/**
* Replace existing greeting tokens in message/subject.
+ *
+ * @param string $tokenString
+ * @param array $contactDetails
+ * @param int $contactId
+ * @param string $className
+ * @param bool $escapeSmarty
*/
public static function replaceGreetingTokens(&$tokenString, $contactDetails = NULL, $contactId = NULL, $className = NULL, $escapeSmarty = FALSE) {