3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = array(); $a['hi'] += 5; print_r($a);
Output for 5.3.0 - 5.6.22, 7.0.0 - 7.1.0
Notice: Undefined index: hi in /in/GOKbp on line 4 Array ( [hi] => 5 )
Output for hhvm-3.10.0 - 3.12.0
Array ( [hi] => 5 )
Output for 4.3.0 - 5.2.17
Notice: Undefined index: hi in /in/GOKbp on line 4 Array ( [hi] => 5 )