Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, class x does not have a method "undefined" in /in/lvfkD:7
Stack trace:
#0 {main}
thrown in /in/lvfkD on line 7
Process exited with code 255.
Output for 8.0.0 - 8.0.9
Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($function) must be a valid callback, class x does not have a method "undefined" in /in/lvfkD:7
Stack trace:
#0 {main}
thrown in /in/lvfkD on line 7
Process exited with code 255.