Bolt\Helpers\Arr::mergeRecursiveDistinct PHP Method

    public static function mergeRecursiveDistinct(array &$array1, array &$array2)
    {
        $merged = $array1;
        foreach ($array2 as $key => &$value) {
            // if $key = 'accept_file_types, don't merge.
            if ($key == 'accept_file_types') {
                $merged[$key] = $array2[$key];
                continue;
            }
            if (is_array($value) && isset($merged[$key]) && is_array($merged[$key])) {
                $merged[$key] = static::mergeRecursiveDistinct($merged[$key], $value);
            } else {
                $merged[$key] = $value;
            }
        }
        return $merged;
    }

 /**
  * Update packages.
  *
  * @param  $packages array Indexed array of package names to update
  * @param  $options  array [Optional] changed option set
  *
  * @throws \Bolt\Exception\PackageManagerException
  *
  * @return int 0 on success or a positive error code on failure
  */
 public function execute(array $packages = [], array $options = [])
 {
     /** @var $composer \Composer\Composer */
     $composer = $this->getComposer();
     $io = $this->getIO();
     $packageManagerOptions = $this->app['extend.action.options'];
     // Handle passed in options
     if (!empty($options)) {
         $options = Arr::mergeRecursiveDistinct($packageManagerOptions, $options);
     } else {
         $options = $packageManagerOptions;
     }
     $install = Installer::create($io, $composer);
     $config = $composer->getConfig();
     $optimize = $config->get('optimize-autoloader');
     // Set preferred install method
     $prefer = $this->getPreferedTarget($config->get('preferred-install'));
     try {
         $install->setDryRun($options['dryrun'])->setVerbose($options['verbose'])->setPreferSource($prefer['source'])->setPreferDist($prefer['dist'])->setDevMode(!$options['nodev'])->setDumpAutoloader(!$options['noautoloader'])->setRunScripts(!$options['noscripts'])->setOptimizeAutoloader($optimize)->setUpdate(true)->setUpdateWhitelist($packages)->setWhitelistDependencies($options['withdependencies'])->setIgnorePlatformRequirements($options['ignoreplatformreqs'])->setPreferStable($options['preferstable'])->setPreferLowest($options['preferlowest'])->disablePlugins();
         return $install->run();
     } catch (\Exception $e) {
         $msg = __CLASS__ . '::' . __FUNCTION__ . ' recieved an error from Composer: ' . $e->getMessage() . ' in ' . $e->getFile() . '::' . $e->getLine();
         $this->app['logger.system']->critical($msg, ['event' => 'exception', 'exception' => $e]);
         throw new PackageManagerException($e->getMessage(), $e->getCode(), $e);
     }
 }