3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $link = preg_replace('/[^a-z0-9-]/', "", strtolower($_POST['link_name']));
Output for 5.3.0 - 7.2.0
Notice: Undefined index: link_name in /in/p1KXS on line 2
Output for 4.3.0 - 5.2.17
Notice: Undefined index: link_name in /in/p1KXS on line 2