3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php echo ucfirst($foo);
Output for 5.0.4 - 7.1.10
Notice: Undefined variable: foo in /in/U2r1j on line 2
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: foo in /in/U2r1j on line 2