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[edit] Last updated: Fri, 24 May 2013

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fflush

(PHP 4 >= 4.0.1, PHP 5)

fflushVuelca la salida a un archivo

Descripción

bool fflush ( resource $handle )

Esta función fuerza una escritura de todas las salidas del buffer a un recurso apuntado por el archivo handle.

Parámetros

handle

El fichero al que se apunta debe ser válido, y debe apuntar a un fichero abierto por fopen() o fsockopen() (y que todavía no esté cerrado por fclose()).

Valores devueltos

Devuelve TRUE en caso de éxito o FALSE en caso de error.

Ejemplos

Ejemplo #1 Ejemplo de escritura de un archivo usando fflush()

<?php
$nombre_archivo 
'bar.txt';

$archivo fopen($nombre_archivo'r+');
rewind($archivo);
fwrite($archivo'Foo');
fflush($archivo);
ftruncate($archivoftell($archivo));
fclose($archivo);
?>

Ver también



add a note add a note User Contributed Notes fflush - [2 notes]
up
0
oryan at zareste dot com
7 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.
up
0
jzho327 at cse dot unsw dot edu dot au
10 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.

 
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