= 8.1.0)fdatasync — Synchronizes data (but not meta-data) to the file說明fdatasync(resource $stream): boolThis function synchronizes st">

fdatasync

(PHP 8 >= 8.1.0)

fdatasync — Synchronizes data (but not meta-data) to the file

說明

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().

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 fdatasync() example

<?php

$file = 'test.txt';

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

fdatasync($stream);
fclose($stream);
?>

參見

  • fflush() - 將緩沖內(nèi)容輸出到文件
  • fsync() - Synchronizes changes to the file (including meta-data)