Filesystem Functions
PHP Manual

fsync

Synchronizes changes to the file (including meta-data)

Description

bool fsync(resource $stream)

This function synchronizes changes to the file, including its meta-data. This is similar to fflush, but it also instructs the operating system to write to the storage media.

Parameters

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).

Return Values

Returns true on success or false on failure.

Examples

Example #1 fsync example

<?php

$file = 'test.txt';

$stream = fopen($file, 'w');
fwrite($stream, 'test data');
fwrite($stream, "\r\n");
fwrite($stream, 'additional data');

fsync($stream);
fclose($stream);
?>

See Also

  • fdatasync
  • fflush