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 — Flushes the output to a file
This function forces a write of all buffered output to the resource
pointed to by the file stream.
streamВказівник на файл має бути дійсним та має вказувати на файл, успішно відкритий функцією fopen() або fsockopen() (та не закритий функцією fclose()).
Приклад #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.