class _StandardizedTest
 {
  public $categories, $description, $test_id, $date_taken;



  function __construct() 
   {
    $categories = array();
  }


  function to_string() 
   {
    $rtn = "";

    $rtn .= "test: $this->date_taken - $this->test_id - $this->description : \n";
    if (count($this->categories)) 
     {
      foreach ($this->categories as $position => $value) 
       {
        $rtn .= "  $position - {$value ["category_id"]} - {$value ["description"]} - {$value ["score"]} \n";
      }
    }

    return $rtn;
  }


}