Curl request not flushing data periodically - php

Question

I am making a curl request to a function and in that function the data is being flushed periodically. So I want to display the data as soon as it is flushed in my calling function. But my response is displayed collectively after the request is over. I want to display response side by side.
Code
require_once 'mystream.php';
stream_wrapper_register("var", "mystream") or die("Failed to register protocol");
$myVar = '';
// Open the "file"
$fp = fopen("var://myVar", "r+");
// Configuration of curl
$ch = curl_init();
$output = ' ';
$url = '';
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $output);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, 0 );
//curl_setopt($ch, CURLOPT_BUFFERSIZE, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FILE, $fp); // Data will be sent to our stream ;-)
curl_exec($ch);
curl_close($ch);
// Don't forget to close the "file" / stream
fclose($fp);
mystream.php code
<?php
class mystream{
protected $buffer = '';
function stream_open($path, $mode, $options, &$opened_path) {
return true;
}
public function stream_write($data) {
ob_start();
echo $data;
ob_end_flush();
ob_flush();
flush();
// Extract the lines ; on y tests, data was 8192 bytes long ; never more
$lines = explode("\n", $data);
// The buffer contains the end of the last line from previous time
// => Is goes at the beginning of the first line we are getting this time
$lines[0] = $this->buffer . $lines[0];
// And the last line os only partial
// => save it for next time, and remove it from the list this time
$nb_lines = count($lines);
$this->buffer = $lines[$nb_lines-1];
unset($lines[$nb_lines-1]);
// Here, do your work with the lines you have in the buffer
//var_dump($lines);
//echo '<hr />';
return strlen($data);
}
}
Any leads would be highly appreciated.