$pos = strpos($url, $getParam);
                    $tmp = substr($url, ($pos + strlen($getParam) + 1));
                    for($i=0; $i<strlen($tmp); $i++){
                        if($tmp[$i]=="&"){
                            break;
                        }
                        $tmpValue .= $tmp[$i];
                    }
                    $url = str_replace($getParam . "=" . $tmpValue, $getParam . "=" . $tmpValue . $value, $url);