PHP 5.5.16 is released

fflush

(PHP 4 >= 4.0.1, PHP 5)

fflushEnvoie tout le contenu généré dans un fichier

Description

bool fflush ( resource $handle )

Force l'écriture de toutes les données bufferisées dans le fichier désigné par handle.

Liste de paramètres

handle

Le pointeur de fichier doit être valide et pointer sur un fichier ouvert avec succès par fopen() ou fsockopen() (et pas encore fermé par fclose()).

Valeurs de retour

Cette fonction retourne TRUE en cas de succès ou FALSE si une erreur survient.

Exemples

Exemple #1 Écriture d'un fichier en utilisant fflush()

<?php
$filename 
'bar.txt';

$file fopen($filename'r+');
rewind($file);
fwrite($file'Foo');
fflush($file);
ftruncate($fileftell($file));
fclose($file);
?>

Voir aussi

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User Contributed Notes 2 notes

up
1
jzho327 at cse dot unsw dot edu dot au
11 years ago
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.
up
1
oryan at zareste dot com
8 years ago
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.
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