3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php if (!function_exists('derp')) { function derp() { return "Test"; } } echo derp();
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Test