php - Echo 'string' while every long loop iteration (flush() not working) -

i have loop takes long execute, , want script display whenever loop iteration done.

echo "hello!";  flush();  for($i = 0; $i < 10; $i ++) {     echo $i;     //5-10 sec execution time     flush(); } 

this not display echos until entire script completed. went wrong?

from php manual:

flush() may not able override buffering scheme of web server , has no effect on client-side buffering in browser. doesn't affect php's userspace output buffering mechanism. means have call both ob_flush() , flush() flush ob output buffers if using those.

echo "hello!"; flush(); ob_flush();  for($i = 0; $i < 10; $i ++) {     echo $i;     //5-10 sec execution time     flush();     ob_flush(); } 

-or- can flush , turn off buffering

<?php //flush (send) output buffer , turn off output buffering while (ob_get_level() > 0)     ob_end_flush();  echo "hello!";  for($i = 0; $i < 10; $i ++) {     echo $i . "\r\n"; }  ?>