3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php // $mystring = null; if (empty($mystring)) { echo 'empty\n'; } if ($mystring == null) { echo 'null\n'; // and warning } if (!isset($mystring)) { echo 'unset\n'; }
Output for 5.0.4 - 7.1.0
empty\n Notice: Undefined variable: mystring in /in/U2bvg on line 8 null\nunset\n
Output for 4.3.0 - 5.0.3
empty\n Notice: Undefined variable: mystring in /in/U2bvg on line 8 null\nunset\n