class Daz_Config {
   private static $instance;

   private function __construct(){
      $this->load();
   }

   private function load() {
      ...
   }

   public function get($key) {
      ...
   }

   public static getInstance(){
      if (!self::$instance) self::$instance = new Daz_Config();
      return self::$instance;
   }
}

Then you can do:
Daz_Config::getInstance()->get('myvalue');

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