3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php ob_start(); for($a=1;$a<=10;$a++){ echo"$a<br>"; ob_flush(); flush(); sleep(1); }
Output for 4.3.0 - 7.2.0
1<br>2<br>3<br>
Process exited with code 137.