Element_OphTrOperationbooking_Operation::sentInvitation PHP Méthode

    public function sentInvitation()
    {
        if (is_null($last_letter = $this->lastLetter)) {
            return false;
        }
        return in_array($last_letter, array(self::LETTER_INVITE, self::LETTER_REMINDER_1, self::LETTER_REMINDER_2, self::LETTER_GP));
    }