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  static public function invoke($hook) {
    $packages = array();
    $results = array();  
    
    $packages['libraries'] = self::$libraries;
    $packages['modules'] = self::$modules;
    
    foreach((array) $packages AS $type => $names){
      foreach((array) $names AS $name){
        switch($type){
          case 'libraries':
            $result = @eval("{$name}::{$hook}();");
            break;
            
          case 'modules':
            $result = @eval("{$name}Module::{$hook}();");
            break;
        }
         
        if (is_array($results)){
          $results = array_merge($results, (array) $result);
        }
      }
    }
    
    return $results;  
  }