3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php if( !(is_null($a)|empty($a)) ) { echo "true"; } else { echo "false"; }
based on BeV6g
Output for 5.0.4 - 7.1.0
Notice: Undefined variable: a in /in/vqgUa on line 4 false
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: a in /in/vqgUa on line 4 false