3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php class one extends two {} class two extends one {}
Output for 5.0.0 - 7.1.0
Fatal error: Class 'two' not found in /in/CBK5V on line 2
Process exited with code 255.
Output for 4.3.2 - 4.4.9
Fatal error: Class one: Cannot inherit from undefined class two in /in/CBK5V on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Class one: Cannot inherit from undefined class two in /in/CBK5V on line 2