3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $ret_str = "online shell "; echo strtolower(preg_replace("/[^A-Za-z0-9_]/", '', str_replace(' ', '_', trim($ret_str)))); $ret_str = preg_replace("/[^A-Za-z0-9_]/", '', $ret_str); $ret_str = preg_replace("/[_]+/", '_', $ret_str); echo "\n".$ret_str;
Output for 4.3.0 - 7.1.0
online_shell onlineshell