3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a=array('uno'=>1, 'dos'=>2); $a['tres']=null; if (isset($a['tres'])) echo "it is set";
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0