Fatal error: Uncaught Error: Undefined constant "is_null" in /in/XiVsv:4
Stack trace:
#0 {main}
thrown in /in/XiVsv on line 4
Process exited with code 255.
Warning: Use of undefined constant is_null - assumed 'is_null' (this will throw an Error in a future version of PHP) in /in/XiVsv on line 4
Array
(
[1] =>
[3] =>
)