(PHP 4 >= 4.0.1, PHP 5, PHP 7, PHP 8)
fflush — Flushes the output to a file
This function forces a write of all buffered output to the resource
pointed to by the file stream
.
stream
The file pointer must be valid, and must point to a file successfully opened by fopen() or fsockopen() (and not yet closed by fclose()).
Example #1 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);?>