how to show results one by one in codeigniter 4 for loop with ob_flush - xmlhttprequest

Question

my problem is: i wan to show data in real time with codeigniter 4
This code results will be out once the for loop is ended
what i wan to do is echo results one by one
i have alrady done this before but not with codeigniter, it's was my own code without any framwork
but now i am stiked here 1 week and no rsults
i use codeigniter 4
and i use aapanel in my server
and this is my phpinfo
my function in my controller Count.php
function startcounter(){
$count = $this-\>request-\>getPost("count");
if (ob_get_level() == 0) ob_start();
for($i=0; $i\<=$count; $i++){
echo $i;
ob_flush();
flush();
sleep(1);
}
ob_end_flush();
exit();
}
My javascript
function startcounter(){
data = "count=5";
var xhr = new XMLHttpRequest();
xhr.open('POST', baseUrl+'/count/startcounter', true);
xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
xhr.send(data);
xhr.onreadystatechange = function () {
if (xhr.readyState == 1) {
resp = xhr.response;
arrs = resp;
if (xhr.readyState == XMLHttpRequest.LOADING) {
console.log(xhr.responseText);
}
if (xhr.readyState == XMLHttpRequest.DONE) {
alert('Done')
}
}
}
}

Answer 1

function testflush(){
ini_set('output_buffering','on');
ini_set('zlib.output_compression', 0);
ini_set('max_execution_time', '3000');
ob_implicit_flush();
$response = service('response');
$response->send();
ob_end_flush();
flush();
for($i=0; $i<=99; $i++){
echo "Test".$i;
ob_flush();
flush();
sleep(1);
}
return $this->response->setJSON(''); // send empty json response (This is
the most important thing)
}