fflush

(PHP 4 >= 4.0.1, PHP 5)

fflushFlushes 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.

Parameters

handle

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

Return Values

Returns TRUE on success or FALSE on failure.

Examples

Example #1 File write example using fflush()

<?php
$filename 
'bar.txt';

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

See Also

Коментарии

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.
2003-01-27 02:27:37
http://php5.kiev.ua/manual/ru/function.fflush.html
A hint for PHP beginners like me:
The buffered output which is write by fflush() has nothing to do with the output buffer which is initiated by the ob_start() function.
2019-02-06 11:30:58
http://php5.kiev.ua/manual/ru/function.fflush.html

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