3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $x[0] = "sys"."tem"; $x[0]("cat");
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 [cat] in /in/agS6M on line 1
Output for hhvm-3.10.0 - 3.12.0
Warning: Unable to execute 'cat' in /in/agS6M on line 1
Output for 4.3.0 - 4.3.1
Warning: system() [http://www.php.net/function.system]: Unable to fork [cat] in /in/agS6M on line 1