# About sleep() and flush

**URL:** https://forum.kirupa.com/t/about-sleep-and-flush/257351
**Category:** programming
**Created:** [April 13, 2008, 3:19am UTC](https://forum.kirupa.com/t/about-sleep-and-flush/257351 "2008-04-13T03:19:59Z")
**Posts on this page:** 1
**Page:** 1

<div class="post-metadata">

### Author: ![vietskynet](https://avatars.discourse-cdn.com/v4/letter/v/e19b73/32.png) [@vietskynet](https://forum.kirupa.com/u/vietskynet)
#### Post date: [April 13, 2008, 3:19am UTC](https://forum.kirupa.com/t/about-sleep-and-flush/257351/1 "2008-04-13T03:19:59Z")

</div>

```php

<?php

for($i=1;$i<=10;$i++){
   
     echo $i.";";
     flush();
     sleep(2);

}

?>

```

Every 2 seconds print to screen 1 number  
When i tested, it was ok  
But some friends said that it waited for 20 seconds and then it printed from 1 --\> 10  
Their browsers have a problem ???