num rows problemer

Min num_rows virker ikke...Kode:

connect.php

<?php

class sql
{
    var $_conn;
    var $_queries = array();
    var $_activeQuery;
  /* husk at indsætte de rigtige oplysniner til din database */
    function connect(){
      $dbhost = "localhost";
      $database = "mobler";
      $dbuser = "root";
      $dbpass = "";
   
      $this->_conn = mysql_connect($dbhost, $dbuser, $dbpass);
      mysql_select_db($database, $this->_conn);
    }
 
    function q($sql_query){
        $query = mysql_query($sql_query, $this->_conn) or die(mysql_error());
      if($query !== false){
          array_unshift($this->_queries, $query);
        $this->_activeQuery = $query;
        return true;
      }
      return false;
    }
  /* Fjernede $q fordi jeg ikke lige kunne regne ud hvorfor den var der */
    function a(){
        $array = null;
      if($this->_activeQuery){
          $array = mysql_fetch_array($this->_activeQuery);
      }
      return $array;
    }
 
    function free(){
        if($this->_activeQuery){
          @mysql_free_result( $this->_activeQuery );
        $this->_activeQuery = array_shift( $this->_queries );
      }
    }
 
    function num_rows(){
        return mysql_num_rows($this->_activeQuery);
    }
 
    function close(){
      @mysql_close($this->_conn);
    }
}
?>

kontakt.php

<?php
include_once('connect.php');

$nyh = "Select * from nyheder";
$test_2 = new sql();
$test_2->connect();
$test_2->q($nyh);

$test_2 = num_rows($nyh);
echo $test_2;


$test_2->close();
?>