3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php echo pow(-2.3, 0.5);
Output for 5.2.2 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
NAN
Output for 4.3.0 - 5.2.1
-NAN