3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $str = 'round(12)'; echo preg_replace('/(?!bcsqrt|bcpow|round|ceil|floor)[^0-9\.\(\)\+\-\/\*%\^:]/', '', $str);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
r(12)