3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = "3&uuml;5"; var_dump(filter_var(a, FILTER_SANITIZE_STRING));
Output for 7.2.0
Warning: Use of undefined constant a - assumed 'a' (this will throw an Error in a future version of PHP) in /in/0TrUY on line 5 string(1) "a"
Output for 5.3.19 - 7.1.10
Notice: Use of undefined constant a - assumed 'a' in /in/0TrUY on line 5 string(1) "a"