PHP中内置变量$_SERVER['DOCUMENT_ROOT']的使用方法

caofei277 2009-11-17 06:31:18

在Apache本地服务器的目录下建立了文件夹BobOrder,在这个文件夹下建立了vieworder.php文件,代码如下：
<?php
//Create short variable name
$DOCUMENT_ROOT =$_SERVER['DOCUMENT_ROOT'];

?>
<html>
<head>

<title>Bob's Auto Parts - Customer Orders'</title>

</head>
<body>

<h1>Bob's Auto Parts'</h1>

<h2>Customer Orders</h2>
<?php
@$fp = fopen("$DOCUMENT_ROOT/../orders.txt",'rb');
if(!$fp){
echo "<p><strong>No orders pending.Please try again later.</strong></p>";
exit;
}
while(!feof($fp)){
$order = fgets($fp,999);
echo $order."<br />";
}
?>

</body>
</html>

结果输出
No orders pending.Please try again later.

但是如果把加红处的代码修改成如下
<?php
//Create short variable name
//$DOCUMENT_ROOT =$_SERVER['DOCUMENT_ROOT'];

?>
<html>
<head>

<title>Bob's Auto Parts - Customer Orders'</title>

</head>
<body>

<h1>Bob's Auto Parts'</h1>

<h2>Customer Orders</h2>
<?php
@$fp = fopen("orders.txt",'rb');
if(!$fp){
echo "<p><strong>No orders pending.Please try again later.</strong></p>";
exit;
}
while(!feof($fp)){
$order = fgets($fp,999);
echo $order."<br />";
}
?>

</body>
</html>
则可以正确输出如下结果：
Bob's Auto Parts'
Customer Orders
16:27 17th November 2009 2 tires 5 oil 4 spark plugs $292.6
16:27 17th November 2009 2 tires 5 oil 4 spark plugs $292.6
16:27 17th November 2009 2 tires 5 oil 4 spark plugs $292.6
16:27 17th November 2009 2 tires 5 oil 4 spark plugs $292.6
16:27 17th November 2009 2 tires 5 oil 4 spark plugs $292.6
16:27 17th November 2009 2 tires 5 oil 4 spark plugs $292.6
请指点一下哪里出错了？
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caofei277 2009-11-17

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[Quote=引用 1 楼 gingzai777 的回复:]
$_SERVER['DOCUMENT_ROOT']."/../orders.txt"是不是同当前目录路径相同，不相同就没得讲，路径都不相同，结果肯定不同。

建议楼主在fopen前，输出一下echo "$DOCUMENT_ROOT/../orders.txt"，看看是不是所要的路径。
[/Quote]

输出的是
/../orders.txt
这个txt文件的绝对路径是
D:\Apache\htdocs\BobOrder\orders.txt
这个怎么解决？