Module.php

<?php

use Zend\Stdlib\ArrayUtils;

//.....

    public function getConfig()
    {
        $config = array();
        $folder = realpath(__DIR__ . '/config');
        $iterator = new DirectoryIterator($folder);
        $filteredIterator = new RegexIterator($iterator,'/\\.config.php$/i');
        foreach($filteredIterator as $file) {
            $name = str_replace('.config.php', '', $file->getFilename();
            $config[$name] = include($file->getPathname());
        }
        return $config
    }