3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php /*function _() { echo 'allowed'; }*/ _();
based on B5CXZ
Output for 5.2.7 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Warning: _() expects exactly 1 parameter, 0 given in /in/U0DYb on line 5
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.2.6
Warning: Wrong parameter count for _() in /in/U0DYb on line 5