simpler.php

<?php

function get($topic, $specific = null, $param = null)
{
    if(isset($this->config[$topic][$specific][$param])) {
        return $this->config[$topic][$specific][$param];
    } elseif(isset($this->config[$topic][$specific])) {
        return $this->config[$topic][$specific];
    }
    return $this->config[$topic] ?: null;
}