3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php system('uname');
Output for 5.6.28, 7.0.14 - 7.1.0
Output for 4.3.2 - 5.6.23, 7.0.0 - 7.0.9
Warning: system(): Unable to fork [uname] in /in/XYdmf on line 2
Output for 4.3.0 - 4.3.1
Warning: system() [http://www.php.net/function.system]: Unable to fork [uname] in /in/XYdmf on line 2