Dot notation config traversing

helpers.php

<?php

if (!function_exists('conf')) {
    /**
     * Look for a dot-delimited name/key reference
     * @param string $name
     * @return mixed|null
     */
    function conf(string $name)
    {
        $keys = explode('.', $name);
        $root = array_shift($keys);
        
        foreach (scandir('../config') as $file) {
            if (in_array($file, [$root.'.php', $root.'.inc']) {
                $keyVal = fn($configs, string $key) => is_array($configs) ? ($configs[$key] ?? null) : null;
                
                return isset($file) ? array_reduce($keys, $keyVal, require $file) : null;
            }
        }
    }
}