3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $string = 'a'; $a = ++$string; $b = $string += 1; var_dump($a); var_dump($b);
Output for 7.1.0
Warning: A non-numeric value encountered in /in/HMQGc on line 5 string(1) "b" int(1)
Output for 4.3.0 - 7.0.14
string(1) "b" int(1)