^ M ^看书自学做例子 报错不知怎么解决 求指教？！

报错在红色字的地方  应该是语法错误  我是照着书做的例子  请大神帮忙看下  谢···<?
  echo "<p>Order processed at". date('H:i, jS F Y'). "</p>";
  echo"<p>Your order is as follows:</p>";
$totalqty=0;                   //总数量
$totalqty=$tireqty+$oilqty+$sparkqty;
echo"Items ordered:".$totalqty."<br />";
if($totalqty==0)                    
{
  echo"You did not order anything on the previous page!<br />";
}
else
{
 if($tireqty>0)
{
      echo $stirqty."tires<br />";
    }
 if($oilqty>0)
{
      echo $oilqty."bottle of oil<br />";
    }
 if($sparkqty>0)
{
      echo $sparkqty."spark plugs<br />";
    }
}
$totalamount=0.00;                        //总价
define('TIREQTY',100);
define('OILQTY',10);
define('SPARKQTY',4);$totalamount=$tireqty*TIREQTY
            +$oilqty*OILQTY
+$sparkqty*SPARKQTY;
echo "Subtotal $".number_format($totalamount,2)."<br />";    //格式化totalamount的数字 保留两位小数
$taxrate=0.10 ;                                                //税
$totalamount=$totalamount*(1+$taxrate);
echo "Total including tax:$".number_format($totalamount,2)."<br />";
echo "<p>Address to ship to is".$address."</p>";$outputstring = $date."\t".$tireqty."tireqty \t".$oilqty."oilqty \t".$sparkqty."spark plugs \t\$".$totalamout."\t".$address."\n";
//opeen file for appending
@ $fp=fopen("$DOCUMENT_ROOT/../bob/hello.txt",'w+');
flock($fp, LOCK_EX)  // 释放文件if(!$fp)
{
  echo"<p><strong>Your order could not be processed at this time. Please try again later.</strong></p></body></html>";
  exit;
}
fwrite($fp,$outputstring,strlen($outputstring));
flock($fp,LOCK_UN);
fclose($fp);
echo"<p>Order written.</p>";
?>