fflush

(PHP 4 >= 4.0.1, PHP 5, PHP 7)

Flushes the output to a file

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()).

Returns:

Returns TRUE on success or FALSE on failure.

Examples:

File write example using fflush()

<?php
$filename = 'bar.txt';
 
$file = fopen($filename, 'r+');
rewind($file);
fwrite($file, 'Foo');
fflush($file);
ftruncate($file, ftell($file));
fclose($file);
?>