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PHP: fflush - Manual
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Last updated: Sun, 25 Nov 2007

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fflush

(PHP 4 >= 4.0.1, PHP 5)

fflush — 出力をファイルにフラッシュする

説明

bool fflush ( resource $handle )

この関数は、バッファリングされた全ての出力をファイルファイルハンドル handle が指すリソースに強制的に書き込みます。

パラメータ

handle

ファイルポインタは、有効なファイルポインタである必要があり、 fopen() または fsockopen() で正常にオープンされた (そしてまだ fclose() でクローズされていない) 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。



add a note add a note User Contributed Notes
fflush
oryan at zareste dot com
31-Oct-2005 09:48
Just a note that fflush takes care of the cache already, at least on my server.  Using clearstatcache before reading a previously written file also worked, but lagged the output time much more noticeably (by two or three seconds), probably due to excess cache erasing beyond files.
jzho327 at cse dot unsw dot edu dot au
27-Jan-2003 05:27
Sorry, the note I previously added regarding fflush() has a bug!

when you read file by calling
$fp = fopen("myfile", "a+");

and you wish to read the content, you have to call
rewind($fp) before you attemp to read it. (Silly me) Or else if you tried something like
$fp = fopen("myfile", "a+");
$content = fread($fp);

// show that content is in fact null
if ($content == NULL)
 print "but it must be first put to rewind<br>\n";

will result

but it must be first put to rewind.
[new line]

in fact, if you are not careful (like me), and you opened it with
$fp = fopen("myfile", "r+");
$content = fread($fp);
..
// do something with content
..
then you tried to again
$content = fread($fp);
without rewind, you'd get NULL again. This sounds trivial, but if you work with several file resources, with freads and fopens everywhere, you can get easily lost. So becareful.

fgetc" width="11" height="7"/> <feof
Last updated: Sun, 25 Nov 2007
 
 
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