PHP flush() under Apache, mod_proxy, php-fpm

ob.php

<?php

function doFlush()
{
	if (!headers_sent()) {
		// Disable gzip in PHP.
		ini_set('zlib.output_compression', 0);

		// Force disable compression in a header.
		// Required for flush in some cases (Apache + mod_proxy, nginx, php-fpm).
		header('Content-Encoding: none');
	}

	// Fill-up 4 kB buffer (should be enough in most cases).
	echo str_pad('', 4 * 1024);

	// Flush all buffers.
	do {
		$flushed = @ob_end_flush();
	} while ($flushed);

	@ob_flush();
	flush();
}

// In a real app, we have this turned on.
ob_start();

$i = 0;
while ($i++ < 10) {
	usleep(500000);

	// Real output.
	echo $i . "\n<br>";

	doFlush();
}

Hi, please see documentation of str_pad.

Basically it takes empty string '' and adds 4096 times space character (third, optional argument of str_pad).

Here is an example of string padded to 4096 bytes: https://3v4l.org/MAIV8

I agree this may not be the best possible solution, I haven't used this since 2016 anyway :-)

Ahh, I see, I forgot about the other params during my late night coding session 🙂
Effectively it's being used like str_repeat in this case

great solution - works! - I love it - Thanks a lot :)