3v4l.org

run code in 300+ PHP versions simultaneously
<?php $_ = array(); $_[$s?:(key($_)++)] = "lol"; var_dump($_);
Output for 5.3.0 - 5.3.18, 5.4.0 - 5.4.8
Fatal error: Can't use function return value in write context in YgjWQ on line 4
Process exited with code 255.
preferences:
171.2 ms | 1399 KiB | 35 Q