eduVPN / vpn-server-api

        // check if any of the required keys is missing

        foreach (array_keys($this->optionList) as $opt) {

            if ($this->optionList[$opt][2]) {

                // required

                if (!array_key_exists($opt, $optionValues)) {

                    throw new CliException(sprintf('missing required parameter "--%s"', $opt));

                }

            }

        }

        // check if any of the options that require a value has no value

        foreach (array_keys($this->optionList) as $opt) {

            if ($this->optionList[$opt][1]) {

                // check if it is actually there

                if (array_key_exists($opt, $optionValues)) {

                    // must have value

                    if (0 === count($optionValues[$opt])) {

                        throw new CliException(sprintf('missing required parameter value for option "--%s"', $opt));

                    }

                }

            }

        }