A hint for PHP beginners like me:
The buffered output which is write by fflush() has nothing to do with the output buffer which is initiated by the ob_start() function.
(PHP 4 >= 4.0.1, PHP 5, PHP 7, PHP 8)
fflush — 将缓冲内容输出到文件
本函数强制将所有缓冲的输出写入
stream 文件句柄所指向的资源。
成功时返回 true， 或者在失败时返回 false。
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)。
示例 #1 File write example using fflush()
<?php
$filename = 'bar.txt';
$file = fopen($filename, 'r+');
rewind($file);
fwrite($file, 'Foo');
fflush($file);
ftruncate($file, ftell($file));
fclose($file);
?>A hint for PHP beginners like me:
The buffered output which is write by fflush() has nothing to do with the output buffer which is initiated by the ob_start() function.