Filesystem 函数
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fclose

(PHP 4, PHP 5)

fclose — 关闭一个已打开的文件指针

说明

bool fclose ( resource $handle )

将 handle 指向的文件关闭。

成功时返回 TRUE， 或者在失败时返回 FALSE.

文件指针必须有效，并且是通过 fopen() 或 fsockopen() 成功打开的。

Example #1 一个简单 fclose() 例子

<?php
  $handle = fopen('somefile.txt', 'r');
  fclose($handle);
?>

参数

handle

The file pointer must be valid, and must point to a file successfully opened by fopen() or fsockopen().

返回值

成功时返回 TRUE， 或者在失败时返回 FALSE.

范例

Example #2 A simple fclose() example

<?php

$handle = fopen('somefile.txt', 'r');

fclose($handle);

?>

参见

Filesystem 函数
在线手册：中文 英文
PHP手册
PHP手册 - N: 关闭一个已打开的文件指针

用户评论:

crrodriguez at opensuse dot org (12-May-2010 05:05)

Note that since PHP 5.3.2 fclose() no longer unlock open file descriptors at shutdown.

sineld at sineld dot com (23-Nov-2006 12:50)

Do not forget, if you are going to read the contents of the file which you have already written via fwrite() or else you have to close the file first.

mark at markvange * com (05-May-2006 05:17)

It is very important to make sure you clear any incoming packets out of the incoming buffer using fread() or some equivalent.  Although you can call fclose() the socket does not actually shut down until the inbound packets have been cleared.  This can lead to some confusion.

williamhamby at williamhamby dot net (08-Apr-2006 02:19)

Trying to understand how 'end foreach' and 'endwhile' differ, I've encountered a problem I can't solve by myself. The following is a fairly easy stock portfolio script. Everything works, except at the end where I want to calculate the average of the gains as represented by $gain[$i].

<?php
$quantity="3";
$stocks=array("iso","grn","bdgr.pk");
$buydates=array("3 jan 2006","1 feb 2006","3 apr 2006");
$prices=array("0.32","0.20","0.95");
$recommends=array("hold","strong buy","buy");
$i=0;
echo"<tr>";
echo "\n<th align='center'>ticker</th>";
echo "\n<th align='center'>buy date</th>";
echo "\n<th align='center'>price $</th>";
echo "\n<th align='center'>recommend</th>";
echo "\n<th align='center'>value $</th>";
echo "\n<th align='center'>change %</th>\n</tr>\n";
foreach($stocks as $stock) {
$fp=fopen("http://","r");
$data=fgetcsv($fp,1000,",");
$values=$data[1];
echo "<tr>\n<td align='center'>".$stock."</td>";
echo "\n<td align='center'>".$buydates[$i]."</td>";
echo "\n<td align='center'>".$prices[$i]."</td>";
echo "\n<td align='center'>".$recommends[$i]."</td>";
echo "\n<td align='center'>".$values."</td>\n<td align='center'>";
echo $gain[$i]=round(((($values-$prices[$i])/$prices[$i])*100),2);
echo "</td>\n</tr>";
fclose ($fp);
$i++;
}
echo "\n<tr>\n<td align='center'>".$gain[$i]."<td>\n</tr>\n";
?>

Help?

James R. Steel (28-Nov-2005 05:02)

In response to kumar mcmillan 'gotcha' note below, we get a different result on a W2K machine:

<?php
$file_pointer = fopen('textfile.dat', 'r');
fclose($file_pointer);
echo '$file_pointer is resource = ' . (is_resource($file_pointer) ? 'true': 'false');
?>

output:
$file_pointer is resource = false

kit dot lester at lycos dot co dot uk (18-Sep-2005 01:34)

fclose() also clears any locks on the file, so if another process was being kept waiting for the lock to be cleared, fclose()ing will allow the other process to continue.

[Another "just-in-case" reason to habitually fclose() all files as soon as practical!]

jricher at jacquesricher dot com (01-Feb-2005 02:06)

It is a GOOD_THING to check the return value from fclose(), as some operating systems only flush file output on close, and can, therefore, return an error from fclose(). You can catch severe data-eating errors by doing this.

I learned this the hard way.

kumar mcmillan (30-Sep-2004 08:10)

gotcha:

<?php

$file_pointer = fopen('data.dat', 'r');
fclose($file_pointer);

echo '$file_pointer is resource = ' . (is_resource($file_pointer) ? 'true': 'false');

?>

output:
$file_pointer is resource = true

daniel7 dot martinez at ps dot ge dot com (11-Sep-2001 12:06)

Generally, it's always a good idea to close a file when you're done with it. It's very easy for something to go wrong and corrupt a file that hasn't been closed properly. If you're concerned about efficiency, the overhead is negligible.