3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a .= "a"; $a .= "b"; $a .= "c";
Output for 5.0.4 - 7.1.0
Notice: Undefined variable: a in /in/etfAj on line 3
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: a in /in/etfAj on line 3