3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $link = preg_replace('/[^a-z0-9-]/', "", strtolower($_POST['link_name']));
Output for 5.3.0 - 5.6.28, hhvm-3.10.0, 7.0.0 - 7.1.0
Notice: Undefined index: link_name in /in/p1KXS on line 2
Output for hhvm-3.12.0
Notice: Undefined index: link_name in /in/p1KXS on line 2 Warning: strtolower() expects parameter 1 to be string, null given 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