3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $val = preg_replace('/16/-16/16-/','','16-17-18-19-20'); echo $val;
based on cNrES
Output for 4.3.11 - 7.2.0
Warning: preg_replace(): Unknown modifier '-' in /in/P9dJZ on line 2
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier '-' in /in/P9dJZ on line 2