3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $_SESSION["X"] = "Hello"; unset($_SESSION["X"]); unset($_SESSION["X"]); //echo $_SESSION["X"];
based on NujHt
Output for 4.3.0 - 5.0.5, 5.1.1 - 7.1.0
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/oATNA on line 6
Process exited with code 255.