Two points worth noting:
1. fsync() is not suitable for high throughput, use it only when the durability of a file write really matters to you.
2. fsync() includes an implicit call to fflush() so you don't need to manually flush before you sync.
fsync
(PHP 8 >= 8.1.0)
fsync — Synchronizes changes to the file (including meta-data)
Description
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
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User Contributed Notes 1 note
Dave Gebler ¶
3 years ago
