3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $k=false; echo '1'+(string)$k+'1'; ?>
based on k4T4B
Output for 7.1.0 - 7.2.0
Warning: A non-numeric value encountered in /in/pF6Yv on line 3 2
Output for 5.3.22 - 7.0.20
2