3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a=array(); $a['x']=7; $a['y']=null; echo $a['x']; echo $a['y']; echo $a['z']; ?>
Output for 5.3.0 - 7.2.0
7 Notice: Undefined index: z in /in/H5EMV on line 7
Output for 4.3.0 - 5.2.17
7 Notice: Undefined index: z in /in/H5EMV on line 7