= 8.1.0)fsync — Synchronizes changes to the file (including meta-data)說明fsync(resource $stream): boolThis function synchronizes changes t">

fsync

(PHP 8 >= 8.1.0)

fsync — Synchronizes changes to the file (including meta-data)

說明

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.

參數(shù)

stream

文件指針必須是有效的，必須指向由 fopen() 或 fsockopen() 成功打開的文件(并還未由 fclose() 關(guān)閉)。

返回值

成功時(shí)返回 true， 或者在失敗時(shí)返回 false。

范例

示例 #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);
?>

參見

  • fdatasync() - Synchronizes data (but not meta-data) to the file
  • fflush() - 將緩沖內(nèi)容輸出到文件