3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php echo "TEST: " . $foo . " ...";
Output for 5.0.4 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Notice: Undefined variable: foo in /in/VdoZN on line 2 TEST: ...
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: foo in /in/VdoZN on line 2 TEST: ...