GEANT / CAT

     * test if zip is available

     */

    private function zip_test() {

        if (exec("which zip") != "") {

            $this->test_return(\core\common\Entity::L_OK, "<strong>zip</strong> binary found.");

        } else {

            $this->test_return(\core\common\Entity::L_ERROR, "<strong>zip</strong> not found in your \$PATH!");

        }

    }

    /**

        exec(CONFIG_DIAGNOSTICS['PATHS']['eapol_test'], $out, $retval);

        if ($retval == 255) {

            $o = preg_grep('/-o<server cert/', $out);

            if (count($o) > 0) {

                $this->test_return(\core\common\Entity::L_OK, "<strong>eapol_test</strong> script found.");

            } else {

                $this->test_return(\core\common\Entity::L_ERROR, "<strong>eapol_test</strong> found, but is too old!");

            }

        } else {

            $this->test_return(\core\common\Entity::L_ERROR, "<strong>eapol_test</strong> not found!");

        }

                $allthere .= $onelanguage['locale'] . " ";

            }

        }

        if ($allthere == "") {

            $this->test_return(\core\common\Entity::L_OK, "All of your configured locales are available on your system.");

        } else {

            $this->test_return(\core\common\Entity::L_WARN, "Some of your configured locales (<strong>$allthere</strong>) are not installed and will not be displayed correctly!");

        }

    }

    const DEFAULTS = [

                fclose($handle);

            }

        }

        if ($defaultvalues != "") {

            $this->test_return(\core\common\Entity::L_WARN, "Your configuration in config/config.php contains unchanged default values or links to inexistent files: <strong>$defaultvalues</strong>!");

        } else {

            $this->test_return(\core\common\Entity::L_OK, "Your configuration does not contain any unchanged defaults, which is a good sign.");

        }

    }

    /**