fdatasync

(PHP 8 >= 8.1.0)

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

说明

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().

参数

stream: 文件指针必须是有效的，必须指向由 fopen() 或 fsockopen() 成功打开的文件(并还未由 fclose() 关闭)。

返回值

成功时返回 true，或者在失败时返回 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);
?>

参见

fflush() - 将缓冲内容输出到文件
fsync() - Synchronizes changes to the file (including meta-data)

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