3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = array(); $a['foo'] = "Hello"; $a['foo']['bar'] = "World"; var_dump($a);
based on udndV
Output for 5.4.0 - 7.1.0
Warning: Illegal string offset 'bar' in /in/WDJfm on line 5 array(1) { ["foo"]=> string(5) "Wello" }
Output for 4.3.0 - 5.3.29
array(1) { ["foo"]=> string(5) "Wello" }