php remove output buffering

Question

I am doing a lot of processing at my PHP page and I want to display progress information to the user, for instance, finished 10% 20% and so. What is happening now is that all the data is displayed at once after processing is done, how can I display it right away!

I tried to set comment out output buffer in php.ini and I tried to use flush() after echo statements, not working, any suggestions?

Here is my code:

ob_start();
while ($line = read_file_line("c:/1.txt")) {  
  $read_lines_count++;
  if($read_lines_count % 100 == 0) {
    echo "parsed $read_lines_count <br />";
  ob_flush();
  }
}

This depends on the server configurtion as well. If you want to be sure, split the job in parts and use ajax. If ajax is an option of course. — jeroen
– jeroen, Commented Apr 11, 2014 at 18:52
@xd6_ I just tried it, nop :( still waits until processing is done... — Amin
– Amin, Commented Apr 11, 2014 at 18:52
@jeroen, I have access to the server, any changes I need to make in php.ini ? — Amin
– Amin, Commented Apr 11, 2014 at 18:53
@AminM I'm not sure, there is a lot more than just php involved. — jeroen
– jeroen, Commented Apr 11, 2014 at 19:07

naab · Accepted Answer · 2014-04-11 19:27:07Z

4

First you need to call ob_start() before any code is printed.

Then echo whatever you want

call ob_flush() when you want to show the buffer on screen.

and at the end, a call to ob_end_flush() to end buffering and show output.

Make sure your php.ini has this line uncommented:

output_buffering = On

More Info : http://www.php.net/manual/en/book.outcontrol.php

edited Apr 11, 2014 at 19:27

answered Apr 11, 2014 at 18:50

naab

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6 Comments

naab Over a year ago

@AminM you need to explicitly set output_buffering to true in the php.ini, commenting the line will set it to false (default's apache value). Do a var_dump(ini_get('output_buffering')) and it will show you the output_buffering configuration

Amin Over a year ago

I just did it's string '4096' (length=4)

naab Over a year ago

@AminM This means that it will buffer up to 4086 bytes at most. Write in your php.ini output_buffering = On php.net/manual/en/…

Amin Over a year ago

yeah sorry! I meant to say I set it to on, vardump is string: 1 :(

naab Over a year ago

@AminM Are you sure the file is long enough ? It might be instant if you try on your localhost or may be fast if the file is less than 1Mb on a remote host and can't even notice it's buffering.

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