PHP with output buffering on

if (ob_get_level() == 0) ob_start();

foreach($posts as $post) {
	ob_flush();
	flush();

  (...... custom code here )
	
	ob_flush();
	flush();
}
printf("<br/>All tasks finished<br/>");
ob_end_flush();
exit;

	<script>
		setInterval(function () {window.scrollTo(0, document.body.scrollHeight);}, 1000);
	</script>