3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php //$s = ''; print "isset: '" . isset($s) . "'. "; print "!empty: '" . !empty($s) . "'"; ?>
based on qGtoG
Output for 4.3.0 - 5.6.30, hhvm-3.10.1 - 3.22.0, 7.0.0 - 7.3.0alpha1
isset: ''. !empty: ''