Need help with PHP flush() !

  • danmerrino
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  • Novice
  • danmerrino
  • Posts: 21

Post 3+ Months Ago

hello fellow nerds!

i am afraid to say that i dont have too much experience with php yet and here is my question:

i am trying to use flush() (or ob_flush(), whichever works) to flush the output-buffer in a script that only runs on my local wamp server.

the only thing i want to do is dump information and variables while the script is running, with echo() or print().

the fact of the matter is, that i have not been able to get it to work at all.

is there anybody here that has any experience with outputting the o-buffer while the script is being executed?

are there any special measures i need to take in order to get it to work? like maybe something in php.ini?

i have read most of the stuff on php.net and other sources but to no avail.

any help is desperately appreciated.

greetings,
dan
  • Bogey
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  • Genius
  • Bogey
  • Posts: 8416
  • Loc: USA

Post 3+ Months Ago

Try the following at the very beginning of the script.
PHP Code: [ Select ]
<?php
 @apache_setenv('no-gzip', 1);
 @ini_set('zlib.output_compression', 0);
 @ini_set('implicit_flush', 1);
 for ($i = 0; $i < ob_get_level(); $i++) { ob_end_flush(); }
 ob_implicit_flush(1);
   
 // All you need is 256 spaces first
 echo str_repeat(" ", 256)."<pre>"; ob_flush();
 
  1. <?php
  2.  @apache_setenv('no-gzip', 1);
  3.  @ini_set('zlib.output_compression', 0);
  4.  @ini_set('implicit_flush', 1);
  5.  for ($i = 0; $i < ob_get_level(); $i++) { ob_end_flush(); }
  6.  ob_implicit_flush(1);
  7.    
  8.  // All you need is 256 spaces first
  9.  echo str_repeat(" ", 256)."<pre>"; ob_flush();
  10.  
  • danmerrino
  • Novice
  • Novice
  • danmerrino
  • Posts: 21

Post 3+ Months Ago

hello and thanks for your answer.

if i use the code exactly like you told me to i get:

Notice: ob_flush() [ref.outcontrol]: failed to flush buffer. No buffer to flush.

i tried to modify it like so:

// All you need is 256 spaces first

ob_start();

echo str_repeat(" ", 256)."<pre>"; ob_flush();

then there was no notice anymore but he didnt flush it either.

more ideas are very welcome.

greetings,
dan
  • Bogey
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  • Genius
  • Bogey
  • Posts: 8416
  • Loc: USA

Post 3+ Months Ago

Alright... below is an example code with the flusher that works... try manipulating the code to work like you want it to.
PHP Code: [ Select ]
<?pbp
@apache_setenv('no-gzip', 1);
@ini_set('zlib.output_compression', 0);
@ini_set('implicit_flush', 1);
for ($i = 0; $i < ob_get_level(); $i++) { ob_end_flush(); }
ob_implicit_flush(1);
 
// All you need is 256 spaces first
echo str_repeat(" ", 256)."<pre>"; ob_flush();
$n = 0;
$p = 0;
for($i=0;$i<60;$i++)
{
   for($i=1;$i<57;$i++)
   {
      echo "$i ";
      ob_flush();
      usleep(1);
      ++$n;
   }
   ++$p;
   echo "<strong> ~ $n , $p</strong>\n";
}
?>
  1. <?pbp
  2. @apache_setenv('no-gzip', 1);
  3. @ini_set('zlib.output_compression', 0);
  4. @ini_set('implicit_flush', 1);
  5. for ($i = 0; $i < ob_get_level(); $i++) { ob_end_flush(); }
  6. ob_implicit_flush(1);
  7.  
  8. // All you need is 256 spaces first
  9. echo str_repeat(" ", 256)."<pre>"; ob_flush();
  10. $n = 0;
  11. $p = 0;
  12. for($i=0;$i<60;$i++)
  13. {
  14.    for($i=1;$i<57;$i++)
  15.    {
  16.       echo "$i ";
  17.       ob_flush();
  18.       usleep(1);
  19.       ++$n;
  20.    }
  21.    ++$p;
  22.    echo "<strong> ~ $n , $p</strong>\n";
  23. }
  24. ?>

I don't know if this would help you at all, maybe if you tell the operating system under which you are trying to run the code on...
  • danmerrino
  • Novice
  • Novice
  • danmerrino
  • Posts: 21

Post 3+ Months Ago

well thanks for that.

its windows xp and wamp 2.0 with apache 2.2.11 and php 5.2.8.

now i get all the notices from the loop:

Notice: ob_flush() [ref.outcontrol]: failed to flush buffer. No buffer to flush.
  • Bogey
  • Genius
  • Genius
  • Bogey
  • Posts: 8416
  • Loc: USA

Post 3+ Months Ago

Well... I don't know what to tell you now... it works perfectly for me... I have no clue what's up with your thing.
  • danmerrino
  • Novice
  • Novice
  • danmerrino
  • Posts: 21

Post 3+ Months Ago

well, thanks for trying!

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