3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $_ = array(); $_[$s?:(key($_)++)] = "lol"; var_dump($_);
Output for 5.3.0 - 5.4.8
Fatal error: Can't use function return value in write context in /in/YgjWQ on line 4
Process exited with code 255.