3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $s1 = 'a'; $s2 = 'b'; var_dump($s1 + $s2);
based on ECa8p
Output for 7.1.0 - 7.2.0
Warning: A non-numeric value encountered in /in/Mi5MX on line 6 Warning: A non-numeric value encountered in /in/Mi5MX on line 6 int(0)
Output for 5.3.18 - 7.0.20
int(0)