3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $ret_str = "online shell "; $ret_str = preg_replace("/[^A-Za-z0-9_]/", '', str_replace(' ', '_', $ret_str)); $ret_str = preg_replace("/[_]+/", '_', $ret_str); echo $ret_str;
Output for 4.3.0 - 7.1.7
online_shell_