3v4l.org

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