3v4l.org - online PHP & HHVM shell, execute code in 100+ different versions!

<?php error_reporting(E_ALL); $foo = 'hello'; var_dump( isset($foo[0][0]) );
Output for 5.4.0 - 5.6.0, php7@20140507 - 20140901, hhvm-3.0.1 - 3.2.0
bool(true)
Output for 4.3.0 - 5.3.29
bool(false)