3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function a() { return 'en_US'; } echo current(explode('_', a()));
Output for 4.3.0 - 5.0.4, 5.1.0 - 7.1.0
en
Output for 5.0.5
Fatal error: Only variables can be passed by reference in /in/9sPI2 on line 5
Process exited with code 255.