3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php class B extends A {} class A extends B {} $b = new B;
Output for 5.0.0 - 7.1.0
Fatal error: Class 'A' not found in /in/e05mq on line 2
Process exited with code 255.
Output for 4.3.2 - 4.4.9
Fatal error: Class b: Cannot inherit from undefined class a in /in/e05mq on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Class b: Cannot inherit from undefined class a in /in/e05mq on line 2