3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php var_dump(`ls`);
Output for 5.0.0 - 5.6.38, 7.0.0 - 7.3.1
NULL
Output for hhvm-3.10.1 - 3.22.0
fork has been disabled for security reasons
Process exited with code 1.
Output for 4.3.0 - 4.4.9
string(0) ""