fflush

(PHP 4 >= 4.0.1, PHP 5)

fflush — Flushes the output to a file

Description

bool fflush ( resource $handle )

This function forces a write of all buffered output to the resource pointed to by the file handle handle. Returns TRUE on success or FALSE on failure.

The file pointer must be valid, and must point to a file successfully opened by fopen() or fsockopen() (and not yet closed by fclose()).

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fflush

oryan at zareste dot com
31-Oct-2005 12:48


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 08:27


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.

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fgetc

feof

Last updated: Fri, 01 Jun 2007