PHP fdatasync() Function
Last Updated :
28 Apr, 2025
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The fdatasync() function is an inbuilt function in PHP that is used to synchronize changes to a file's data with the underlying storage device. This function is similar to the fsync() function, but it only synchronizes the file's data, not its metadata.
Syntax:
bool fdatasync(resource $stream)
Parameters: This function takes one parameter which is described below:
- $stream: A file pointer resource that was obtained using the fopen() function.
Return Value: The fdatasync() function returns true if the synchronization was successful otherwise it will return false.
Example 1: The following program demonstrates the fdatasync() function.
<?php
$fp = fopen('example.txt', 'w');
fwrite($fp, 'Hello, world!');
if (fdatasync($fp)) {
echo "Changes to the file's data were successfully synchronized.";
} else {
echo "Failed to synchronize changes to the file's data.";
}
fclose($fp);
?>
Output:
Changes to the file's data were successfully synchronized.
Example 2: The following program demonstrates the fdatasync() function.
<?php
$fp = fopen('example.txt', 'w');
fwrite($fp, 'Hello, world!');
fdatasync($fp);
fclose($fp);
echo "Changes to the file's data were successfully synchronized.";
?>
Output:
Changes to the file's data were successfully synchronized.
Reference: https://www.php.net/manual/en/function.fdatasync.php
