3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $test = array(); $test['a'] = 123; $test['b'] = null; var_dump( isset($test['a']) ? $test['a'] : isset($test['b']) ? $test['b'] : "default" );
based on iRKRu
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
NULL