fsync

(PHP 8 >= 8.1.0)

fsyncSynchronizes changes to the file (including meta-data)

Description

fsync(resource $stream): bool

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() - Synchronizes data (but not meta-data) to the file
  • fflush() - Flushes the output to a file