3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $x = 'y'; $$x = 'z'; echo $x; // outputs 'y' echo $$x; //
based on Ue2JD
Output for 4.3.0 - 5.0.5, 5.1.1 - 7.1.0
yz
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/PogVP on line 5
Process exited with code 255.