Controllers\xAPI\DocumentController::checkParams PHP Метод

    public function checkParams($required = [], $optional = [], $data = null)
    {
        $return_data = [];
        if (is_null($data)) {
            $data = $this->params;
        }
        // Checks required parameters.
        foreach ($required as $name => $expectedType) {
            if (!isset($data[$name])) {
                throw new Exceptions\Exception('Required parameter is missing - ' . $name);
            } else {
                if ($expectedType !== null) {
                    $return_data[$name] = $this->requiredValue($name, $data[$name], $expectedType);
                } else {
                    $return_data[$name] = $data[$name];
                }
            }
        }
        // Checks optional parameters.
        foreach ($optional as $name => $expectedType) {
            if (!isset($data[$name])) {
                $return_data[$name] = null;
            } else {
                if ($expectedType !== null) {
                    $return_data[$name] = $this->optionalValue($name, $data[$name], $expectedType);
                } else {
                    $return_data[$name] = $data[$name];
                }
            }
        }
        return $return_data;
    }