php is not echoing text while executing

Question

I have a php script that gets called from a upload form, the script puts entries into a database. I would like to see the results on my browser as the script is running. I am using the code below, but the output shows up after the whole script has finished executing. My server is Apache2 running on Ubuntu. I thought by using ob_start(); I can see the progress while the script is executing. Am I doing something wrong in my code?

 ob_start();
 foreach ($csvAsArray as $value)
 {
  $username = $value[0];
  $password = $value[1];
  $db->insert($username, $password, $machine);
  echo $username . " Inserted into database! <br />";
  ob_flush();
 }
 echo('done.');
 ob_end_flush();

On the contrary, the output buffering is used to capture the output instead of sending it to the browser. — axiac
– axiac, Commented Apr 17, 2016 at 17:22

Mm-Art-In · Accepted Answer · 2016-04-17 17:34:53Z

1

You don't need ob_start :

<?php

 for($i=0;$i<100;$i++)
 {
  echo $i;
  flush();
  ob_flush();
  sleep(1);
 }
 echo 'done.';
 ob_end_flush();

 ?>

From Comment:

php flush : Flushes the system write buffers of PHP and whatever backend PHP is using (CGI, a web server, etc). This attempts to push current output all the way to the browser with a few caveats. flush() may not be able to override the buffering scheme of your web server and it has no effect on any client-side buffering in the browser. It also doesn't affect PHP's userspace output buffering mechanism. This means you will have to call both ob_flush() and flush() to flush the ob output buffers if you are using those.

edited Apr 17, 2016 at 17:34

Mm-Art-In

23k13 gold badges81 silver badges144 bronze badges

answered Apr 17, 2016 at 16:44

christophe

3812 silver badges5 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Alon Eitan Over a year ago

Please provide explanation to the code, for other users that will need help with similar issues in future

christophe Over a year ago

php flush : Flushes the system write buffers of PHP and whatever backend PHP is using (CGI, a web server, etc). This attempts to push current output all the way to the browser with a few caveats. flush() may not be able to override the buffering scheme of your web server and it has no effect on any client-side buffering in the browser. It also doesn't affect PHP's userspace output buffering mechanism. This means you will have to call both ob_flush() and flush() to flush the ob output buffers if you are using those.

TheAlexLichter Over a year ago

@christophe It'd be more helpful if you'd explain your code inside your answer

Maninderpreet Singh · Accepted Answer · 2016-04-17 17:20:06Z

0

Try with this use ob_get_contents() to get data

   ob_start();
   foreach ($csvAsArray as $value)
   {
     $username = $value[0];
     $password = $value[1];
     $db->insert($username, $password, $machine);
     echo $username . " Inserted into database! <br />";

 }
  $data = ob_get_contents();
  ob_end_clean();
  var_dump($data);

answered Apr 17, 2016 at 17:20

Maninderpreet Singh

2,5972 gold badges19 silver badges31 bronze badges

Collectives™ on Stack Overflow

php is not echoing text while executing

2 Answers 2

3 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related