3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $var= 'wtf'; var_dump(filter_var($var, FILTER_VALIDATE_BOOLEAN)); ?>
based on pf4rI
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
bool(false)