3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump(realpath(__DIR__ . "/"));
Output for 5.3.0 - 7.1.0
string(3) "/in"
Output for 4.3.0 - 5.2.17
Notice: Use of undefined constant __DIR__ - assumed '__DIR__' in /in/nVVbS on line 2 bool(false)