3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php chdir('/tmp'); echo realpath(null);
Output for 5.2.1 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
/tmp
Output for 4.3.0 - 5.2.0