CascadiaPHP 2024


(PHP 8 >= 8.1.0)

fdatasyncSynchronizes data (but not meta-data) to the file


fdatasync(resource $stream): bool

This function synchronizes stream contents to storage media, just like fsync() does, but it does not synchronize file meta-data. Note that this function is only effectively different in POSIX systems. In Windows, this function is aliased to fsync().

Elenco dei parametri


Il puntatore al file deve essere valido, e deve puntare ad un file aperto con successo da fopen() o fsockopen() (e non ancora chiuso da fclose()).

Valori restituiti

Restituisce true in caso di successo, false in caso di fallimento.


Example #1 fdatasync() example


= 'test.txt';

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


Vedere anche:

  • fflush() - Invia l'output in un file
  • fsync() - Synchronizes changes to the file (including meta-data)

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User Contributed Notes 1 note

greg at example dot com
11 months ago
Does not flush st_atime, st_mtime or st_size.

If you need to use filesize after a write you will need need fsync() or fflush() instead.
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