Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, function "echo" not found or invalid function name in /in/hjm9Z:3
Stack trace:
#0 {main}
thrown in /in/hjm9Z on line 3
Process exited with code 255.
Output for 8.0.0 - 8.0.9
Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($function) must be a valid callback, function "echo" not found or invalid function name in /in/hjm9Z:3
Stack trace:
#0 {main}
thrown in /in/hjm9Z on line 3
Process exited with code 255.