3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $x[] = 'foo'; $k = null; $x[$k] = 'bar'; $x[$k] = 'baz'; var_dump($x);
based on 1gvHe
Output for 4.3.0 - 7.2.0
array(2) { [0]=> string(3) "foo" [""]=> string(3) "baz" }