woah

tests seem to fail because of diff in order of result arr:

Testing for array_diff([14, -3, -14, 16, -11, 2, 13, 6, -12, 0, 10, -12, -14], [-11, -7, -7, 3, -2, 20, -7, 11, 3, 16, 18, 1, 6, -11, -18, 0, 7, 3])
[14, -3, -14, -14, 2, 13, -12, -12, 10] should equal
[14, -3, -14, 2, 13, -12, 10, -12, -14]

Completed in 0.02ms

There are a few more examples but here it's easiest to see.
There's nothing in the instructions about the result print order, nor does there appear to be any concrete ordering to the test arrays.

would apprecaise the help,
Thanks.