PMA\libraries\plugins\auth\AuthenticationCookie::createIV PHP Method

    public function createIV()
    {
        /* Testsuite shortcut only to allow predictable IV */
        if (!is_null($this->_cookie_iv)) {
            return $this->_cookie_iv;
        }
        if (self::useOpenSSL()) {
            return openssl_random_pseudo_bytes($this->getIVSize());
        } else {
            return Crypt\Random::string($this->getIVSize());
        }
    }