3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = [1,2,3,4]; $v = end(array_keys($a)); var_dump($v);
based on AA12m
Output for 7.0.0 - 7.2.0
Notice: Only variables should be passed by reference in /in/Drg0V on line 5 int(3)
Output for 5.4.9 - 5.6.28
Strict Standards: Only variables should be passed by reference in /in/Drg0V on line 5 int(3)
Output for 5.3.19 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/Drg0V on line 3
Process exited with code 255.