fclose

(PHP 4, PHP 5)

fclose — オープンされたファイルポインタをクローズする

説明

bool fclose ( resource $handle )

handleが指しているファイルをクローズします。

パラメータ

handle: ファイルポインタは有効なものでなければならず、また fopen()またはfsockopen() で正常にオープンされたファイルを指している必要があります。

返り値

成功した場合に TRUE を、失敗した場合に FALSE を返します。

例

例1 シンプルな fclose() の例


<?php

$handle = fopen('somefile.txt', 'r');

fclose($handle);

?>

参考

fopen() - ファイルまたは URL をオープンする
fsockopen() - インターネット接続もしくは Unix ドメインソケット接続をオープンする

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[edit] Last updated: Fri, 25 May 2012

add a note User Contributed Notes fclose

crrodriguez at opensuse dot org 11-May-2010 09:05


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

sineld at sineld dot com 23-Nov-2006 04:50


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 04-May-2006 09:17


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 07-Apr-2006 06:19


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 09:02


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 05:34


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 06:06


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 12:10


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 10-Sep-2001 04:06


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.

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