3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = 23; $aa = 2233; echo "a${'a'}b";
based on W8REN
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
a23b