3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $key = 'hey'; $st = array( $key => 19 ); $baz = array('foo', 'bar', 'baz', 'quux'); echo $st['foo'];
Output for 5.3.0 - 7.2.0
Notice: Undefined index: foo in /in/TYveF on line 10
Output for 4.3.0 - 5.2.17
Notice: Undefined index: foo in /in/TYveF on line 10