3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $arr = array(0,null,3,null); $filtered = array_filter($arr, is_null); print_r($filtered);
based on ZZQUu
Output for 7.2.0
Warning: Use of undefined constant is_null - assumed 'is_null' (this will throw an Error in a future version of PHP) in /in/XiVsv on line 4 Array ( [1] => [3] => )
Output for 5.3.17 - 7.1.10
Notice: Use of undefined constant is_null - assumed 'is_null' in /in/XiVsv on line 4 Array ( [1] => [3] => )