3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $heading = 'h2'; $heading += 4; echo $heading;
Output for 7.1.0 - 7.2.0
Warning: A non-numeric value encountered in /in/AF6Ak on line 3 4
Output for 4.3.0 - 7.0.20
4