当使用完文件后，应该将其关闭。应该按照如下所示的方式调用fclose函数：
fclose($fp);
如果该文件被成功地关闭，函数将返回一个true值。反之，该函数将返回false。通常，关闭文件的操作并不像打开文件容易出错，所以在这个例子中我们并没有对该操作进行测试。
processorder.php的完整脚本清单如程序清单2-2所示。
程序清单2-2 processorder.php——订单处理脚本的最终版本
＜?php
//create short variable names
$tireqty=$_POST['tireqty'];
$oilqty=$_POST['oilqty'];
$sparkqty=$_POST['sparkqty'];
$address=$_POST['address'];
$DOCUMENT_ROOT=$_SERVER['DOCUMENT_ROOT'];
$date=date('H:i,jS F Y');
?＞
＜html＞
＜head＞
＜title＞Bob's Auto Parts-Order Results＜/title＞
＜/head＞
＜body＞
＜h1＞Bob's Auto Parts＜/h1＞
＜h2＞Order Results＜/h2＞
＜?php
echo"＜p＞Order processed at".date('H:i,jS F Y')."＜/p＞";
echo"＜p＞Your order is as follows:＜/p＞";
$totalqty=0;
$totalqty=$tireqty+$oilqty+$sparkqty;
echo"Items ordered:".$totalqty."＜br/＞";
if($totalqty==0){
echo"You did not order anything on the previous page!＜br/＞";
}else{
if($tireqty＞0){
echo$tireqty."tires＜br/＞";
}
if($oilqty＞0){
echo$oilqty."bottles of oil＜br/＞";
}
if($sparkqty＞0){
echo$sparkqty."spark plugs＜br/＞";
}
}
$totalamount=0.00;
define('TIREPRICE',100);
define('OILPRICE',10);
define('SPARKPRICE',4);
$totalamount=$tireqty*TIREPRICE
+$oilqty*OILPRICE
+$sparkqty*SPARKPRICE;
$totalamount=number_format($totalamount,2,'.','');
echo"＜p＞Total of order is$".$totalamount."＜/p＞";
echo"＜p＞Address to ship to is".$address."＜/p＞";
$outputstring=$date."/t".$tireqty."tires/t".$oilqty."oil/t"
.$sparkqty."spark plugs/t/$".$totalamount
."/t".$address."/n";
//open file for appending
@$fp=fopen("$DOCUMENT_ROOT/../orders/orders.txt",'ab');
flock($fp,LOCK_EX);
if(!$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＞";
?＞
＜/body＞