Fatal error: Uncaught Error: Undefined constant "a" in /in/54IGP:12
Stack trace:
#0 {main}
thrown in /in/54IGP on line 12
Process exited with code 255.
Warning: Use of undefined constant a - assumed 'a' (this will throw an Error in a future version of PHP) in /in/54IGP on line 12
Array
(
[0] => A
[1] => B
[2] => C
[3] => D
)