3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $x[0] = "sys"."tem"; $x[0]("id");
Output for 5.6.28, 7.0.14 - 7.1.0
Output for 4.3.2 - 5.6.25, 7.0.0 - 7.0.10
Warning: system(): Unable to fork [id] in /in/SjO8J on line 3
Output for hhvm-3.10.0 - 3.12.0
Failed to exec: `id'
Output for 4.3.0 - 4.3.1
Warning: system() [http://www.php.net/function.system]: Unable to fork [id] in /in/SjO8J on line 3