3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a='d'; $b='a'; $c='b'; $d='a'; echo "$a {$$a} $$$a $$$a $$$$a $$$$$a";
Output for 4.3.0 - 7.1.0, 7.1.6 - 7.1.7
d a $$d $$d $$$d $$$$d
Output for 7.1.5

Process exited with code 137.