php implicit_flush command not working correctly

Question

I have been trying to get my server to be able to flush an echo or print after sleeping and have been unsuccessful. Im using PHP 5.3.24 under Windows. There are literally dozens and dozens of suggestions out there, just about all of which I tried, none of which has worked. Here is some code that I thought may have worked:

ob_implicit_flush(true);
ob_end_flush();
for ($i=0; $i<10; $i++) {
   echo $i.'<br>';
   sleep(1);
}

This code will not do anything for 9 seconds and then output everything.

I have tried:

-outputting over 1000 characters at the top of the page since there was a suggestion that the browser my be caching,

-added header( 'Content-type: text/html; charset=utf-8' ); header("Cache-Control: no-cache, must-revalidate");header ("Pragma: no-cache");

-used flush(); and ob_flush(); commands,

-made output_buffering = Off, zlib.output_compression = Off, and implicit_flush = Yes (or implicit_flush = On, seen both examples) in the php.ini,

-also tried @ini_set('zlib.output_compression',0); @ini_set('implicit_flush',1); @ob_end_clean(); set_time_limit(0);

Plus others that I am probably forgetting.

Is there something I am missing? Thanks.

I should have mentioned before, I have this running in IIS 7 in windows Server 2008 R2. — srs
– srs, Commented Sep 30, 2013 at 18:28

a4c8b · Accepted Answer · 2013-09-30 19:19:02Z

1

Looks like browser caching. Try this (tested successfully):

ob_implicit_flush(true);
ob_end_flush();
for ($i=0; $i<10; $i++) {
   echo $i.'<br>';
   echo str_repeat(' ', 1024);
   sleep(1);
}

Not a fine solution, but it proves that you simple have to put more characters into the browser buffer.

answered Sep 30, 2013 at 19:19

a4c8b

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3 Comments

srs Over a year ago

Thanks for replying, but unfortunately that did not work. I have tried padding the characters before the loop and during (as per your code), but it still does not work.

a4c8b Over a year ago

Have you tried to do a raw http request by hand? In linux, 'echo -e "GET /script.php HTTP/1.0\r\nHost: mydomain.com\r\n\r\n" | nc mydomain.com 80' would do it. Just to see if its buffered in the webserver of in the browser. In my configuration (Apache and Firefox), your code got buffered in Firefox and mine worked. The command above should show, if its an browser or IIS related problem

srs Over a year ago

Thanks. I ran it from the windows command line and it works how it should, even if I remove the flush commands from the code. That removes the php install out of the equation, but it could still be an IIS issue or a browser issue. But thank you, it is further than I have gotten before.

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