3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $arr = [1,2,3]; var_dump(key(array_values($arr))); var_dump(end(array_values($arr)));
based on b31gp
Output for 7.0.0 - 7.2.0
int(0) Notice: Only variables should be passed by reference in /in/d9QYP on line 4 int(3)
Output for 5.4.0 - 5.6.28
int(0) Strict Standards: Only variables should be passed by reference in /in/d9QYP on line 4 int(3)