PhpCsFixer\Fixer\ClassNotation\ClassDefinitionFixer::configure PHP Method

    public function configure(array $configuration = null)
    {
        if (null === $configuration) {
            $this->config = self::$defaultConfig;
            return;
        }
        $configuration = array_merge(self::$defaultConfig, $configuration);
        foreach ($configuration as $item => $value) {
            if (!array_key_exists($item, self::$defaultConfig)) {
                throw new InvalidFixerConfigurationException('class_definition', sprintf('Unknown configuration item "%s", expected any of "%s".', $item, implode(', ', array_keys(self::$defaultConfig))));
            }
            if (!is_bool($value)) {
                throw new InvalidFixerConfigurationException('class_definition', sprintf('Configuration value for item "%s" must be a bool, got "%s".', $item, is_object($value) ? get_class($value) : gettype($value)));
            }
        }
        $this->config = $configuration;
    }