Caching ?

[Phhere]

Hi,
i think it would be greate if there would be a real caching function.
I extended the SteamAPIDriver with an easy caching function.
Maybe it is something which could be merged into the source code

<?php
namespace Neoseeker\SteamAPI;
class SteamAPIDriverCached extends SteamAPIDriver {
    protected $cacheDir = './cache/';
    protected $cacheTime = 300;
    protected $enabled = true;
    public function __construct() {
        parent::__construct();
    }

    public function get_xml($resource = null) {
        $location = $this->get_xml_location();
        $cacheFile = $this->cacheDir.md5($location).'.dat';
        if($this->enabled && file_exists($cacheFile) && filemtime($cacheFile) > time()-$this->cacheTime){
            $content = file_get_contents($cacheFile);
        }
        else{
            $content = file_get_contents($location);
            file_put_contents($cacheFile, $content);
        }
        $xml_response = @simplexml_load_string($content, null, LIBXML_NOCDATA);
        if ($xml_response == false) {
            return false;
        }
        return $xml_response;
    }
}

?>