3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = 1 . $x . 2 + 3 - 4;
based on WFmc7
Output for 5.0.4 - 7.2.0
Notice: Undefined variable: x in /in/Dmep9 on line 3
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: x in /in/Dmep9 on line 3